31 (number) . 31 (thirty-one) is the natural number following 30 and preceding 32. It is a prime number. Explore the curious properties of number 31, an odd number which is prime. Includes mathematical info, prime factorization, divisors, bases and much more! A fascinating reference. The number 31 can be divided by 2 positive divisors (out of which none is even, and 2 are odd). The sum of these divisors (counting 31) is 32, the average is 16.

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Fun facts about the number 31, from gallium to galaxies and beyond, this number shines in science, math, and more.

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