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One is by convention not considered a prime number; although universal today, this was a matter of some controversy until the mid-20th century.

the brain is composed of two hemispheres and a cord linking the two. Either of these can be removed without the person losing any memories or mental capacities.


Aristotle's 3 kinds of soul:             

  • Threptike (nutritive, vegetative)

  • Aisthetike (sensitive, animal)

  • Noetike (rational, human)


The mammalian heart consists of four chambers.

According to ancient Greek philosophers such as Aristotle, the universe is made up of five classical elements: water, earth, air, fire, and ether.


The sixfold symmetry of snowflakes arises from the hexagonal crystal structure of ordinary ice.


There are seven fundamental types of catastrophes.


In cooking recipes, there are approximately 8 pinches to a teaspoon.


"A stitch in time saves nine"


To reduce something by one tenth is to decimate


The 11th moon of Jupiter is Himalia.


Herakles carries out twelve labours.[12]


A baker's dozen, devil's dozen, long dozen, or long measure is 13, one more than a standard dozen.


There are 14 days in a fortnight.


15 is the magic constant of the unique order-3 normal magic square:

8    1    6

3    5    7

4    9    2  

Louis XVI was the last king of France before the fall of the monarchy during the French Revolution.  


According to MIT, 17 is 'the least random number'. This is supposedly because in a study where respondents were asked to choose a random number from 1 to 20, 17 was the most common choice.


There are 18 chapters in James Joyce's novel Ulysses.


Some organs use the 19th harmonic to approximate a minor third.


20 is the number of moves (quarter or half turns) required to optimally solve a Rubik's Cube in the worst case.


Duncan MacDougall reported that 21 grams is the weight of the soul, according to an experiment.


There are 22 stars in the Paramount Pictures logo.


He had been sailing for 23 years without an accident.


Four and twenty is the number of blackbirds baked in a pie


On average, there is 25% DNA overlap of an individual with their half-sibling, grandparent, grandchild, aunt, uncle, niece, nephew, identical twin cousin (offspring of identical twins), or double cousin


The Greek Strongs number G26 is "Agape", which means "Love".


Dark matter is thought to make up 27% of the universe.[citation needed]


The average human menstrual cycle is 28 days although no link has been established with the nightlighting and the Moon.


"$29.00" is a song on the album Blue Valentine by Tom Waits.


In Franz Kafka's novel The Trial Joseph wakes up on the morning of his thirtieth birthday to find himself under arrest for an unspecified crime


There are 31 letters in Macedonian alphabet


An adult human has 32 teeth, including wisdom teeth.


The atomic number of arsenic is 33.


The traffic code of Istanbul, Turkey is 34.


35 mm film is the basic film gauge most commonly used for both analog photography and motion pictures.


36 Views of Mount Fuji is a famous series of prints by Japanese ukiyo-e artist Katsushika Hokusai


William Shakespeare is thought to have written 37 plays (counting Henry IV as three parts).


The 38th parallel north is the pre-Korean War boundary between North Korea and South Korea.


The duration of the nuclear reaction in the largest nuclear explosion ever performed (Tsar bomb) was 39 nanoseconds.


Negative forty is the unique temperature at which the Fahrenheit and Celsius scales correspond; that is, −40 °F = −40 °C. It is referred to as either "minus forty" or "forty below".

Symphony No. 41, the longest and last symphony of Wolfgang Amadeus Mozart.


Rule Forty-two in Alice's Adventures in Wonderland ("All persons more than a mile high to leave the court").


The name of a popular Spanish liqueur is Cuarenta y tres, and it is distilled with 43 different herbs and spices.


Born from a foreign mother, his blood of ancient heroes,

And his name will be forty and four.


In years of marriage, the 45th wedding anniversary is the sapphire wedding anniversary.


A human has 46 chromosomes.


A mathematical proof, written in 1964 by Professor Donald Bentley, supposedly demonstrates that all numbers are equal to 47.


Johann Sebastian Bach's Well-Tempered Clavier is informally known as The Forty-Eight because it consists of a prelude and a fugue in each major and minor key, for a total of forty-eight pieces.


Siddhartha Gautama spent 49 days and nights meditating as a holy man.


The speed limit of Australian and Canadian roads with unspecified limits 50 kilometres per hour.


Area 51, a parcel of U.S. military-controlled land in southern Nevada, apparently containing a secret aircraft testing facility.


On the modern piano there are 52 white keys (notes in the C major scale).

There are 53 Hail Mary beads on a standard, five decade Catholic Rosary.


There are 54 years in three Saros cycles of eclipses of the sun and moon, which is known as a Triple Saros or exeligmos (Greek: "turn of the wheel").


The Élysée, the official residency of the French Republic president, which address is 55 rue du Faubourg-Saint-Honoré in Paris.


Shirley Temple, as a child, wore 56 curls in her hair. Curls were set by her mother who thus made sure of the exact number.


In the movie Contagion, Vaccine #57 successfully protects the lab monkey from infection.


The minimum wind speed needed to issue a Severe Thunderstorm Warning is 58mph.


59 is the number on a button commonly worn by feminist activists in the 1970s; this was based on the claim that a woman earned 59 cents to an equally qualified man's dollar.

60 is the smallest number divisible by the numbers 1 to 6: there is no smaller number divisible by the numbers 1 to 5.


The chemical element with the atomic number 61 is promethium.


The sum of the number of faces, edges and vertices of icosahedron or dodecahedron is 62.


The offspring of a donkey and a horse has 63 chromosomes.


64 is the first whole number that is both a perfect square and a perfect cube.


65 is the magic constant of 5 by 5 normal magic square:

17        24        1          8          15
23        5          7          14        16
4          6          1          20        22
10        12        19        21        3
11        18        25        2          9


In the video game Fullmetal Alchemist, elusive villain Barry the Chopper is imprisoned in cell number 66, which later becomes his alias when battling the brothers at Laboratory Five.


There are 67 throws in judo.


68 is the largest known number to be the sum of two primes in exactly two different ways:

68 = 7 + 61 = 31 + 37


The number 69 can refer to the sex position involving each partner aligning themselves to achieve oral sex simultaneously at each other.


In Islamic history and in Islamic interpretation the number 70 or 72 is most often and generally hyperbole for an infinite amount:


There are 71 different characters that can be used with a standard English keyboard, excluding uppercase letters.

There are 72 languages spoken at the Tower of Babylon, according to later tradition.


Shakespeare’s Sonnet 73

That time of year thou mayst in me behold,
When yellow leaves, or none, or few, do hang
Upon those boughs which shake against the cold,
Bare ruined choirs, where late the sweet birds sang;
In me thou seest the twilight of such day
As after sunset fadeth in the west,
Which by and by black night doth take away,
Death's second self that seals up all in rest;
In me thou seest the glowing of such fire
That on the ashes of his youth doth lie,
As the deathbed whereon it must expire,
Consum'd with that which it was nourish'd by;
This thou perceiv'st, which makes thy love more strong,
To love that well, which thou must leave ere long.


John Cage’s composition 74 from his number pieces requires 2 pianos, 2 percussionists, harp and strings (14-10-8-8-6)


The age limit for Canadian senators is 75.


The Little Dumbbell Nebula in the constellation Pegasus is designated as Messier object 76 (M76).


During World War II in Sweden at the border with Norway, "77" was used as a shibboleth (password), because the tricky pronunciation in Swedish made it easy to instantly discern whether the speaker was native Swedish, Norwegian, or German.


In reference to gramophone records, 78 refers those meant to be spun at 78 revolutions per minute.


79 is the smallest number that can not be represented as a sum of fewer than 19 fourth powers.


According to Exodus 7:7, Moses was 80 years old when he initially spoke to Pharaoh on behalf of his people. Today, 80 years of age is the upper age limit for cardinals to vote in papal elections.


There are 81 squares on a shogi playing board.


82 is the ISBN Group Identifier for books published in Norway.


When someone reaches 83 they may celebrate a second bar mitzvah


It takes Uranus 84 Earth years to orbit the sun once


85P/Boethin is a periodic comet


There are 86 metals on the modern periodic table.


An answer to a popular puzzle question states 16, 06, 68, 88, xx, 98.
The answer is 87 when looked upside down.


In Kill Bill, the name of O-Ren Ishii's Army is the Crazy 88s.


89 is the title of a currently-unreleased song by Bon Iver


As an atomic weight, 90 identifies an isotope of strontium, a by-product of nuclear reactions including fallout. It contaminates milk.


If one has one each of the coins of denominations less than a dollar (penny, nickel, dime, quarter and half dollar), one has 91 cents.


The number 92 runs through almost every single of British film-maker Peter Greenaway's films. It is said the number itself is based on a mathematical error in calculations concerning John Cage's work Indeterminacy.


In classical Persian finger counting, the number 93 is represented by a closed fist. Because of this, classical Arab and Persian poets around 1 CE referred to someone's lack of generosity by saying that the person's hand made "ninety-three".


Haydn’s Symphony No 94 contains a surprise.

In statistics, a 95% confidence interval is considered satisfactory for most purposes.


"96 Quite Bitter Beings" is a song recorded by rock band CKY.


The 10-97 police code means "arrived on the scene".


98.6 degrees Fahrenheit is normal body temperature.


99 is the highest two digit number in decimal.


On the Celsius scale, 100 degrees is the boiling temperature of pure water at sea level.

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