31113925 has 24 divisors (see below), whose sum is σ = 41941760. Its totient is φ = 22809600.

The previous prime is 31113923. The next prime is 31113947. The reversal of 31113925 is 52931113.

It is not a de Polignac number, because 31113925 - 2¹ = 31113923 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 31113925.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31113923) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 13669 + ... + 15781.

Almost surely, 2^31113925 is an apocalyptic number.

It is an amenable number.

31113925 is a deficient number, since it is larger than the sum of its proper divisors (10827835).

31113925 is a wasteful number, since it uses less digits than its factorization.

31113925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2173 (or 2168 counting only the distinct ones).

The product of its digits is 810, while the sum is 25.

The square root of 31113925 is about 5577.9857475616. The cubic root of 31113925 is about 314.5224139257.

The spelling of 31113925 in words is "thirty-one million, one hundred thirteen thousand, nine hundred twenty-five".