231213562131 has 16 divisors (see below), whose sum is σ = 325052064000. Its totient is φ = 145785807648.

The previous prime is 231213562117. The next prime is 231213562157. The reversal of 231213562131 is 131265312132.

It is not a de Polignac number, because 231213562131 - 2⁷ = 231213562003 is a prime.

It is a super-2 number, since 2×231213562131² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (231213562331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3351816 + ... + 3420101.

It is an arithmetic number, because the mean of its divisors is an integer number (20315754000).

Almost surely, 2^231213562131 is an apocalyptic number.

231213562131 is a deficient number, since it is larger than the sum of its proper divisors (93838501869).

231213562131 is a wasteful number, since it uses less digits than its factorization.

231213562131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6772538.

The product of its digits is 6480, while the sum is 30.

Adding to 231213562131 its reverse (131265312132), we get a palindrome (362478874263).

The spelling of 231213562131 in words is "two hundred thirty-one billion, two hundred thirteen million, five hundred sixty-two thousand, one hundred thirty-one".