31197480520 has 16 divisors (see below), whose sum is σ = 70194331260. Its totient is φ = 12478992192.

The previous prime is 31197480493. The next prime is 31197480557. The reversal of 31197480520 is 2508479113.

It can be written as a sum of positive squares in 2 ways, for example, as 31179790084 + 17690436 = 176578^2 + 4206^2 .

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 779937013 = 31197480520 / (3 + 1 + 1 + 9 + 7 + 4 + 8 + 0 + 5 + 2 + 0).

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, 389968467 + ... + 389968546.

Almost surely, 2^31197480520 is an apocalyptic number.

It is an amenable number.

31197480520 is an abundant number, since it is smaller than the sum of its proper divisors (38996850740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31197480520 is a wasteful number, since it uses less digits than its factorization.

31197480520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779937024 (or 779937020 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 40.

The spelling of 31197480520 in words is "thirty-one billion, one hundred ninety-seven million, four hundred eighty thousand, five hundred twenty".