31013825 has 6 divisors (see below), whose sum is σ = 38457174. Its totient is φ = 24811040.

The previous prime is 31013809. The next prime is 31013837. The reversal of 31013825 is 52831013.

It can be written as a sum of positive squares in 3 ways, for example, as 64 + 31013761 = 8^2 + 5569^2 .

It is not a de Polignac number, because 31013825 - 2⁴ = 31013809 is a prime.

It is a super-2 number, since 2×31013825² = 1923714682261250, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31013825.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 620252 + ... + 620301.

It is an arithmetic number, because the mean of its divisors is an integer number (6409529).

Almost surely, 2^31013825 is an apocalyptic number.

It is an amenable number.

31013825 is a deficient number, since it is larger than the sum of its proper divisors (7443349).

31013825 is a wasteful number, since it uses less digits than its factorization.

31013825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1240563 (or 1240558 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 31013825 is about 5569.0057460915. The cubic root of 31013825 is about 314.1847567801.

Adding to 31013825 its reverse (52831013), we get a palindrome (83844838).

The spelling of 31013825 in words is "thirty-one million, thirteen thousand, eight hundred twenty-five".