257599231 has 2 divisors, whose sum is σ = 257599232. Its totient is φ = 257599230.

The previous prime is 257599229. The next prime is 257599259. The reversal of 257599231 is 132995752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 257599231 - 2¹ = 257599229 is a prime.

It is a super-2 number, since 2×257599231² = 132714727623582722, which contains 22 as substring.

Together with 257599229, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257599211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128799615 + 128799616.

It is an arithmetic number, because the mean of its divisors is an integer number (128799616).

Almost surely, 2^257599231 is an apocalyptic number.

257599231 is a deficient number, since it is larger than the sum of its proper divisors (1).

257599231 is an equidigital number, since it uses as much as digits as its factorization.

257599231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 170100, while the sum is 43.

The square root of 257599231 is about 16049.8981616707. The cubic root of 257599231 is about 636.2798754696.

The spelling of 257599231 in words is "two hundred fifty-seven million, five hundred ninety-nine thousand, two hundred thirty-one".