31225625 has 20 divisors (see below), whose sum is σ = 39887232. Its totient is φ = 24426000.

The previous prime is 31225613. The next prime is 31225633. The reversal of 31225625 is 52652213.

It is a de Polignac number, because none of the positive numbers 2^k-31225625 is a prime.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31225594 and 31225603.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 28844 + ... + 29906.

Almost surely, 2^31225625 is an apocalyptic number.

It is an amenable number.

31225625 is a deficient number, since it is larger than the sum of its proper divisors (8661607).

31225625 is an equidigital number, since it uses as much as digits as its factorization.

31225625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1130 (or 1115 counting only the distinct ones).

The product of its digits is 3600, while the sum is 26.

The square root of 31225625 is about 5587.9893521731. The cubic root of 31225625 is about 314.8983463036.

Adding to 31225625 its reverse (52652213), we get a palindrome (83877838).

The spelling of 31225625 in words is "thirty-one million, two hundred twenty-five thousand, six hundred twenty-five".