31561313315 has 24 divisors (see below), whose sum is σ = 44468801712. Its totient is φ = 21439763520.

The previous prime is 31561313309. The next prime is 31561313323. The reversal of 31561313315 is 51331316513.

It is not a de Polignac number, because 31561313315 - 2²⁸ = 31292877859 is a prime.

It is a super-2 number, since 2×31561313315² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 575756 + ... + 628185.

It is an arithmetic number, because the mean of its divisors is an integer number (1852866738).

Almost surely, 2^31561313315 is an apocalyptic number.

31561313315 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

31561313315 is a deficient number, since it is larger than the sum of its proper divisors (12907488397).

31561313315 is a wasteful number, since it uses less digits than its factorization.

31561313315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1204067 (or 1204060 counting only the distinct ones).

The product of its digits is 12150, while the sum is 32.

Adding to 31561313315 its reverse (51331316513), we get a palindrome (82892629828).

The spelling of 31561313315 in words is "thirty-one billion, five hundred sixty-one million, three hundred thirteen thousand, three hundred fifteen".