231223957 has 2 divisors, whose sum is σ = 231223958. Its totient is φ = 231223956.

The previous prime is 231223933. The next prime is 231223963. The reversal of 231223957 is 759322132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 231222436 + 1521 = 15206^2 + 39^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231223957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231223997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115611978 + 115611979.

It is an arithmetic number, because the mean of its divisors is an integer number (115611979).

Almost surely, 2^231223957 is an apocalyptic number.

It is an amenable number.

231223957 is a deficient number, since it is larger than the sum of its proper divisors (1).

231223957 is an equidigital number, since it uses as much as digits as its factorization.

231223957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 34.

The square root of 231223957 is about 15206.0500130705. The cubic root of 231223957 is about 613.7774704916. Note that the first 3 decimals are identical.

The spelling of 231223957 in words is "two hundred thirty-one million, two hundred twenty-three thousand, nine hundred fifty-seven".