31913132 has 12 divisors (see below), whose sum is σ = 55901160. Its totient is φ = 15941376.

The previous prime is 31913113. The next prime is 31913177. The reversal of 31913132 is 23131913.

It is a junction number, because it is equal to n+sod(n) for n = 31913098 and 31913107.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1868 + ... + 8204.

It is an arithmetic number, because the mean of its divisors is an integer number (4658430).

Almost surely, 2^31913132 is an apocalyptic number.

It is an amenable number.

31913132 is a deficient number, since it is larger than the sum of its proper divisors (23988028).

31913132 is a wasteful number, since it uses less digits than its factorization.

31913132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7600 (or 7598 counting only the distinct ones).

The product of its digits is 486, while the sum is 23.

The square root of 31913132 is about 5649.1709126207. The cubic root of 31913132 is about 317.1926701431.

The spelling of 31913132 in words is "thirty-one million, nine hundred thirteen thousand, one hundred thirty-two".