257102239 has 2 divisors, whose sum is σ = 257102240. Its totient is φ = 257102238.

The previous prime is 257102231. The next prime is 257102273. The reversal of 257102239 is 932201752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 257102239 - 2³ = 257102231 is a prime.

It is a super-2 number, since 2×257102239² = 132203122597626242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 257102239.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257102231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128551119 + 128551120.

It is an arithmetic number, because the mean of its divisors is an integer number (128551120).

Almost surely, 2^257102239 is an apocalyptic number.

257102239 is a deficient number, since it is larger than the sum of its proper divisors (1).

257102239 is an equidigital number, since it uses as much as digits as its factorization.

257102239 is an evil number, because the sum of its binary digits is even.

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

The square root of 257102239 is about 16034.4079716091. The cubic root of 257102239 is about 635.8704156636.

The spelling of 257102239 in words is "two hundred fifty-seven million, one hundred two thousand, two hundred thirty-nine".