Mathematical properties
- It is the ninth prime number, after 19 and before 29.
- It is a prime factorial, 4! – 1.
- It is a safe prime number, that is to say (23-1)/2 it is still a prime number.
- It is a Woodall prime number.
- It's a Wedderburn-Etherington number.
- It is the second issue of Smarandache-Wellin, base concatenation 10 of the first three prime numbers, and it is also Smarandache-Wellin's second first.
- It is a number n with multiple solutions to the equation x – f(x) = n than any lower number, except for 1. It is therefore a highly significant number.
- The number of digits in 23! that's right 23; the other numbers with this property are 22 e 24.
- It is one of only two numbers that require ben 9 positive cubes to be represented; in fact it is
; the other number that enjoys this property is 239. If negative cubes are also allowed, then they are enough 5: 
. - It is the smallest number of rods needed to stiffen a cube.
- It's a happy number.
- It is the atomic number of vanadium (V).
- 23 Thalia is the name of an asteroid named in honor of the muse Thalia.
- The Earth's axis is shifted by 23,5 degrees.
- It is the number of chromosomes in human germ cells.
- In the biorhythmic theory of Swoboda and Fliess, the Physical cycle lasts 23 days and influences vitality, resistance to fatigue and environmental aggression, vigor and tolerance.
- As explained by the Birthday Paradox, if they are in a room 23 or more people, the probability that at least two of them were born on the same day is greater than 50%.
- The Latin alphabet has 23 easier.
- According to legend, Adam and Eve would have 23 daughters.
- Julius Caesar was assassinated with 23 stab wounds.
- The Templars had 23 Great Masters.
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