31257323144 has 16 divisors (see below), whose sum is σ = 58734619020. Its totient is φ = 15594758080.

The previous prime is 31257323117. The next prime is 31257323159. The reversal of 31257323144 is 44132375213.

It can be written as a sum of positive squares in 2 ways, for example, as 28438775044 + 2818548100 = 168638^2 + 53090^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4234019 + ... + 4241394.

Almost surely, 2^31257323144 is an apocalyptic number.

It is an amenable number.

31257323144 is a deficient number, since it is larger than the sum of its proper divisors (27477295876).

31257323144 is a wasteful number, since it uses less digits than its factorization.

31257323144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8475880 (or 8475876 counting only the distinct ones).

The product of its digits is 60480, while the sum is 35.

Adding to 31257323144 its reverse (44132375213), we get a palindrome (75389698357).

The spelling of 31257323144 in words is "thirty-one billion, two hundred fifty-seven million, three hundred twenty-three thousand, one hundred forty-four".