31297925 has 12 divisors (see below), whose sum is σ = 38884416. Its totient is φ = 24990000.

The previous prime is 31297913. The next prime is 31297951. The reversal of 31297925 is 52979213.

It is not a de Polignac number, because 31297925 - 2¹⁶ = 31232389 is a prime.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17942 + ... + 19608.

It is an arithmetic number, because the mean of its divisors is an integer number (3240368).

Almost surely, 2^31297925 is an apocalyptic number.

It is an amenable number.

31297925 is a deficient number, since it is larger than the sum of its proper divisors (7586491).

31297925 is a wasteful number, since it uses less digits than its factorization.

31297925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2428 (or 2423 counting only the distinct ones).

The product of its digits is 34020, while the sum is 38.

The square root of 31297925 is about 5594.4548438610. The cubic root of 31297925 is about 315.1411981416.

The spelling of 31297925 in words is "thirty-one million, two hundred ninety-seven thousand, nine hundred twenty-five".