231312322131 has 32 divisors (see below), whose sum is σ = 341134847232. Its totient is φ = 138239861760.

The previous prime is 231312322099. The next prime is 231312322139. The reversal of 231312322131 is 131223213132.

It is not a de Polignac number, because 231312322131 - 2⁵ = 231312322099 is a prime.

It is a super-2 number, since 2×231312322131² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (231312322139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18598491 + ... + 18610923.

It is an arithmetic number, because the mean of its divisors is an integer number (10660463976).

Almost surely, 2^231312322131 is an apocalyptic number.

231312322131 is a deficient number, since it is larger than the sum of its proper divisors (109822525101).

231312322131 is a wasteful number, since it uses less digits than its factorization.

231312322131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20243.

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

Adding to 231312322131 its reverse (131223213132), we get a palindrome (362535535263).

The spelling of 231312322131 in words is "two hundred thirty-one billion, three hundred twelve million, three hundred twenty-two thousand, one hundred thirty-one".