31820925 has 24 divisors (see below), whose sum is σ = 54037216. Its totient is φ = 16511040.

The previous prime is 31820909. The next prime is 31820939. The reversal of 31820925 is 52902813.

It is a happy number.

It is not a de Polignac number, because 31820925 - 2⁴ = 31820909 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31820892 and 31820901.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2959 + ... + 8508.

Almost surely, 2^31820925 is an apocalyptic number.

It is an amenable number.

31820925 is a deficient number, since it is larger than the sum of its proper divisors (22216291).

31820925 is a wasteful number, since it uses less digits than its factorization.

31820925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11517 (or 11512 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 31820925 is about 5641.0039000164. The cubic root of 31820925 is about 316.8868859066.

The spelling of 31820925 in words is "thirty-one million, eight hundred twenty thousand, nine hundred twenty-five".