257897999 has 2 divisors, whose sum is σ = 257898000. Its totient is φ = 257897998.

The previous prime is 257897993. The next prime is 257898023. The reversal of 257897999 is 999798752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 257897999 - 2¹² = 257893903 is a prime.

It is a super-2 number, since 2×257897999² = 133022755776408002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257897993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128948999 + 128949000.

It is an arithmetic number, because the mean of its divisors is an integer number (128949000).

Almost surely, 2^257897999 is an apocalyptic number.

257897999 is a deficient number, since it is larger than the sum of its proper divisors (1).

257897999 is an equidigital number, since it uses as much as digits as its factorization.

257897999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25719120, while the sum is 65.

The square root of 257897999 is about 16059.2029378796. The cubic root of 257897999 is about 636.5257698623.

The spelling of 257897999 in words is "two hundred fifty-seven million, eight hundred ninety-seven thousand, nine hundred ninety-nine".