231320881931 has 2 divisors, whose sum is σ = 231320881932. Its totient is φ = 231320881930.

The previous prime is 231320881919. The next prime is 231320881943. The reversal of 231320881931 is 139188023132.

It is a balanced prime because it is at equal distance from previous prime (231320881919) and next prime (231320881943).

It is a cyclic number.

It is not a de Polignac number, because 231320881931 - 2¹⁰ = 231320880907 is a prime.

It is a super-2 number, since 2×231320881931² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (231320881991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115660440965 + 115660440966.

It is an arithmetic number, because the mean of its divisors is an integer number (115660440966).

Almost surely, 2^231320881931 is an apocalyptic number.

231320881931 is a deficient number, since it is larger than the sum of its proper divisors (1).

231320881931 is an equidigital number, since it uses as much as digits as its factorization.

231320881931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 41.

The spelling of 231320881931 in words is "two hundred thirty-one billion, three hundred twenty million, eight hundred eighty-one thousand, nine hundred thirty-one".