231312311257 has 2 divisors, whose sum is σ = 231312311258. Its totient is φ = 231312311256.

The previous prime is 231312311221. The next prime is 231312311317. The reversal of 231312311257 is 752113213132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 205731187776 + 25581123481 = 453576^2 + 159941^2 .

It is a cyclic number.

It is not a de Polignac number, because 231312311257 - 2²⁷ = 231178093529 is a prime.

It is not a weakly prime, because it can be changed into another prime (231312311057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115656155628 + 115656155629.

It is an arithmetic number, because the mean of its divisors is an integer number (115656155629).

Almost surely, 2^231312311257 is an apocalyptic number.

It is an amenable number.

231312311257 is a deficient number, since it is larger than the sum of its proper divisors (1).

231312311257 is an equidigital number, since it uses as much as digits as its factorization.

231312311257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 31.

Adding to 231312311257 its reverse (752113213132), we get a palindrome (983425524389).

The spelling of 231312311257 in words is "two hundred thirty-one billion, three hundred twelve million, three hundred eleven thousand, two hundred fifty-seven".