231232123131 has 4 divisors (see below), whose sum is σ = 308309497512. Its totient is φ = 154154748752.

The previous prime is 231232123103. The next prime is 231232123139. The reversal of 231232123131 is 131321232132.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 231232123131 - 2¹⁷ = 231231992059 is a prime.

It is a super-2 number, since 2×231232123131² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (231232123139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38538687186 + ... + 38538687191.

It is an arithmetic number, because the mean of its divisors is an integer number (77077374378).

Almost surely, 2^231232123131 is an apocalyptic number.

231232123131 is a deficient number, since it is larger than the sum of its proper divisors (77077374381).

231232123131 is an equidigital number, since it uses as much as digits as its factorization.

231232123131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77077374380.

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

Adding to 231232123131 its reverse (131321232132), we get a palindrome (362553355263).

The spelling of 231232123131 in words is "two hundred thirty-one billion, two hundred thirty-two million, one hundred twenty-three thousand, one hundred thirty-one".