257943871 has 2 divisors, whose sum is σ = 257943872. Its totient is φ = 257943870.

The previous prime is 257943859. The next prime is 257943899. The reversal of 257943871 is 178349752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 257943871 - 2⁷ = 257943743 is a prime.

It is equal to p_14089798 and since 257943871 and 14089798 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257943841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128971935 + 128971936.

It is an arithmetic number, because the mean of its divisors is an integer number (128971936).

Almost surely, 2^257943871 is an apocalyptic number.

257943871 is a deficient number, since it is larger than the sum of its proper divisors (1).

257943871 is an equidigital number, since it uses as much as digits as its factorization.

257943871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 423360, while the sum is 46.

The square root of 257943871 is about 16060.6310897175. The cubic root of 257943871 is about 636.5635069770.

The spelling of 257943871 in words is "two hundred fifty-seven million, nine hundred forty-three thousand, eight hundred seventy-one".