257831087 has 2 divisors, whose sum is σ = 257831088. Its totient is φ = 257831086.

The previous prime is 257831051. The next prime is 257831099. The reversal of 257831087 is 780138752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 257831087 - 2⁶ = 257831023 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257831687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128915543 + 128915544.

It is an arithmetic number, because the mean of its divisors is an integer number (128915544).

Almost surely, 2^257831087 is an apocalyptic number.

257831087 is a deficient number, since it is larger than the sum of its proper divisors (1).

257831087 is an equidigital number, since it uses as much as digits as its factorization.

257831087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 94080, while the sum is 41.

The square root of 257831087 is about 16057.1195112947. The cubic root of 257831087 is about 636.4707159308.

The spelling of 257831087 in words is "two hundred fifty-seven million, eight hundred thirty-one thousand, eighty-seven".