31865052131 has 8 divisors (see below), whose sum is σ = 35280709824. Its totient is φ = 28535866920.

The previous prime is 31865052101. The next prime is 31865052137. The reversal of 31865052131 is 13125056813.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-31865052131 is a prime.

It is a super-2 number, since 2×31865052131² (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 = 31865052091 and 31865052100.

It is not an unprimeable number, because it can be changed into a prime (31865052137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21617345 + ... + 21618818.

It is an arithmetic number, because the mean of its divisors is an integer number (4410088728).

Almost surely, 2^31865052131 is an apocalyptic number.

31865052131 is a deficient number, since it is larger than the sum of its proper divisors (3415657693).

31865052131 is a wasteful number, since it uses less digits than its factorization.

31865052131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43236241.

The product of its (nonzero) digits is 21600, while the sum is 35.

The spelling of 31865052131 in words is "thirty-one billion, eight hundred sixty-five million, fifty-two thousand, one hundred thirty-one".