31313025 has 18 divisors (see below), whose sum is σ = 56085510. Its totient is φ = 16700160.

The previous prime is 31313017. The next prime is 31313039. The reversal of 31313025 is 52031313.

It can be written as a sum of positive squares in 3 ways, for example, as 1238769 + 30074256 = 1113^2 + 5484^2 .

It is not a de Polignac number, because 31313025 - 2³ = 31313017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31312989 and 31313007.

It is an unprimeable number.

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 17 ways as a sum of consecutive naturals, for example, 69360 + ... + 69809.

Almost surely, 2^31313025 is an apocalyptic number.

It is an amenable number.

31313025 is a deficient number, since it is larger than the sum of its proper divisors (24772485).

31313025 is a wasteful number, since it uses less digits than its factorization.

31313025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139185 (or 139177 counting only the distinct ones).

The product of its (nonzero) digits is 270, while the sum is 18.

The square root of 31313025 is about 5595.8042317436. The cubic root of 31313025 is about 315.1918710112.

Adding to 31313025 its reverse (52031313), we get a palindrome (83344338).

The spelling of 31313025 in words is "thirty-one million, three hundred thirteen thousand, twenty-five".