23231531231 has 4 divisors (see below), whose sum is σ = 23231876712. Its totient is φ = 23231185752.

The previous prime is 23231531221. The next prime is 23231531243. The reversal of 23231531231 is 13213513232.

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 23231531231 - 2²⁶ = 23164422367 is a prime.

It is a super-2 number, since 2×23231531231² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23231531231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23231531221) 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, 35561 + ... + 218466.

It is an arithmetic number, because the mean of its divisors is an integer number (5807969178).

Almost surely, 2^23231531231 is an apocalyptic number.

23231531231 is a deficient number, since it is larger than the sum of its proper divisors (345481).

23231531231 is an equidigital number, since it uses as much as digits as its factorization.

23231531231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345480.

The product of its digits is 3240, while the sum is 26.

The spelling of 23231531231 in words is "twenty-three billion, two hundred thirty-one million, five hundred thirty-one thousand, two hundred thirty-one".