31890525 has 12 divisors (see below), whose sum is σ = 52725792. Its totient is φ = 17008240.

The previous prime is 31890511. The next prime is 31890533. The reversal of 31890525 is 52509813.

31890525 = 774² + 775² + ... + 823².

It is not a de Polignac number, because 31890525 - 2⁹ = 31890013 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 212529 + ... + 212678.

It is an arithmetic number, because the mean of its divisors is an integer number (4393816).

Almost surely, 2^31890525 is an apocalyptic number.

It is an amenable number.

31890525 is a deficient number, since it is larger than the sum of its proper divisors (20835267).

31890525 is a wasteful number, since it uses less digits than its factorization.

31890525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425220 (or 425215 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 31890525 is about 5647.1696450523. The cubic root of 31890525 is about 317.1177535581.

The spelling of 31890525 in words is "thirty-one million, eight hundred ninety thousand, five hundred twenty-five".