231509580031 has 2 divisors, whose sum is σ = 231509580032. Its totient is φ = 231509580030.

The previous prime is 231509580023. The next prime is 231509580053. The reversal of 231509580031 is 130085905132.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231509580031 - 2³ = 231509580023 is a prime.

It is a super-2 number, since 2×231509580031² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231509580061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115754790015 + 115754790016.

It is an arithmetic number, because the mean of its divisors is an integer number (115754790016).

Almost surely, 2^231509580031 is an apocalyptic number.

231509580031 is a deficient number, since it is larger than the sum of its proper divisors (1).

231509580031 is an equidigital number, since it uses as much as digits as its factorization.

231509580031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 37.

The spelling of 231509580031 in words is "two hundred thirty-one billion, five hundred nine million, five hundred eighty thousand, thirty-one".