31311563131 has 16 divisors (see below), whose sum is σ = 32520096000. Its totient is φ = 30123957888.

The previous prime is 31311563119. The next prime is 31311563161. The reversal of 31311563131 is 13136511313.

It is not a de Polignac number, because 31311563131 - 2⁹ = 31311562619 is a prime.

It is a super-2 number, since 2×31311563131² (a number of 22 digits) 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 31311563131.

It is not an unprimeable number, because it can be changed into a prime (31311563111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1216665 + ... + 1242133.

It is an arithmetic number, because the mean of its divisors is an integer number (2032506000).

Almost surely, 2^31311563131 is an apocalyptic number.

31311563131 is a deficient number, since it is larger than the sum of its proper divisors (1208532869).

31311563131 is a wasteful number, since it uses less digits than its factorization.

31311563131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25878.

The product of its digits is 2430, while the sum is 28.

The spelling of 31311563131 in words is "thirty-one billion, three hundred eleven million, five hundred sixty-three thousand, one hundred thirty-one".