231693257 has 2 divisors, whose sum is σ = 231693258. Its totient is φ = 231693256.

The previous prime is 231693251. The next prime is 231693307. The reversal of 231693257 is 752396132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 214212496 + 17480761 = 14636^2 + 4181^2 .

It is a cyclic number.

It is not a de Polignac number, because 231693257 - 2⁶ = 231693193 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231693257.

It is not a weakly prime, because it can be changed into another prime (231693251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115846628 + 115846629.

It is an arithmetic number, because the mean of its divisors is an integer number (115846629).

Almost surely, 2^231693257 is an apocalyptic number.

It is an amenable number.

231693257 is a deficient number, since it is larger than the sum of its proper divisors (1).

231693257 is an equidigital number, since it uses as much as digits as its factorization.

231693257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 38.

The square root of 231693257 is about 15221.4735489045. The cubic root of 231693257 is about 614.1924377442.

The spelling of 231693257 in words is "two hundred thirty-one million, six hundred ninety-three thousand, two hundred fifty-seven".