31013312131 has 6 divisors (see below), whose sum is σ = 31751326860. Its totient is φ = 30292070508.

The previous prime is 31013312111. The next prime is 31013312159. The reversal of 31013312131 is 13121331013.

It is a de Polignac number, because none of the positive numbers 2^k-31013312131 is a prime.

It is a super-2 number, since 2×31013312131² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31013312099 and 31013312108.

It is not an unprimeable number, because it can be changed into a prime (31013312111) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8384661 + ... + 8388358.

It is an arithmetic number, because the mean of its divisors is an integer number (5291887810).

Almost surely, 2^31013312131 is an apocalyptic number.

31013312131 is a deficient number, since it is larger than the sum of its proper divisors (738014729).

31013312131 is an equidigital number, since it uses as much as digits as its factorization.

31013312131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16773105 (or 16773062 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 19.

Adding to 31013312131 its reverse (13121331013), we get a palindrome (44134643144).

The spelling of 31013312131 in words is "thirty-one billion, thirteen million, three hundred twelve thousand, one hundred thirty-one".