231560831 has 2 divisors, whose sum is σ = 231560832. Its totient is φ = 231560830.

The previous prime is 231560801. The next prime is 231560839. The reversal of 231560831 is 138065132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231560831 - 2⁶ = 231560767 is a prime.

It is a super-2 number, since 2×231560831² = 107240836906821122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 231560794 and 231560803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231560839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115780415 + 115780416.

It is an arithmetic number, because the mean of its divisors is an integer number (115780416).

Almost surely, 2^231560831 is an apocalyptic number.

231560831 is a deficient number, since it is larger than the sum of its proper divisors (1).

231560831 is an equidigital number, since it uses as much as digits as its factorization.

231560831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 231560831 is about 15217.1229540935. The cubic root of 231560831 is about 614.0754000286.

The spelling of 231560831 in words is "two hundred thirty-one million, five hundred sixty thousand, eight hundred thirty-one".