What is 31?

31 is a positive integer that comes after 30 and before 32. It is a prime number, meaning it can only be evenly divided by 1 and itself. Its factors are 1 and 31.

In mathematics, 31 is a Sophie Germain prime, which means 2p+1 is also a prime number, where p is equal to 31. It is also a safe prime, because p and (p-1)/2 are both prime numbers.

In Roman numerals, 31 is written as XXXI. In binary code, it is written as 11111, and in hexadecimal notation, it is 1F.

31 days are present in seven months of the Gregorian calendar year - January, March, May, July, August, October, and December.

In religion, the number 31 is used in various ways. In numerology, it is often associated with creativity, communication, and expression. In Judaism, the 31st day of the month is Rosh Chodesh (the beginning of a new month), and in Islam, 31 is the number of chapters in the Quran.

31 is also used in popular culture. For example, in the TV series "Stranger Things," Eleven's favorite food is Eggo waffles that come in a pack of 31, and in the card game "Bridge," there are 31 tricks in a game.