231312130220031 has 32 divisors (see below), whose sum is σ = 367246236745728. Its totient is φ = 126719079009120.

The previous prime is 231312130219967. The next prime is 231312130220047. The reversal of 231312130220031 is 130022031213132.

It is not a de Polignac number, because 231312130220031 - 2⁶ = 231312130219967 is a prime.

It is a super-2 number, since 2×231312130220031² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 231312130219983 and 231312130220010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231312130220071) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1660295635 + ... + 1660434948.

It is an arithmetic number, because the mean of its divisors is an integer number (11476444898304).

Almost surely, 2^{231312130220031} is an apocalyptic number.

231312130220031 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

231312130220031 is a deficient number, since it is larger than the sum of its proper divisors (135934106525697).

231312130220031 is a wasteful number, since it uses less digits than its factorization.

231312130220031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3320730731.

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 231312130220031 its reverse (130022031213132), we get a palindrome (361334161433163).

The spelling of 231312130220031 in words is "two hundred thirty-one trillion, three hundred twelve billion, one hundred thirty million, two hundred twenty thousand, thirty-one".