257765243 has 2 divisors, whose sum is σ = 257765244. Its totient is φ = 257765242.

The previous prime is 257765219. The next prime is 257765251. The reversal of 257765243 is 342567752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 257765243 - 2²² = 253570939 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 257765243.

It is not a weakly prime, because it can be changed into another prime (257765143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128882621 + 128882622.

It is an arithmetic number, because the mean of its divisors is an integer number (128882622).

Almost surely, 2^257765243 is an apocalyptic number.

257765243 is a deficient number, since it is larger than the sum of its proper divisors (1).

257765243 is an equidigital number, since it uses as much as digits as its factorization.

257765243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 352800, while the sum is 41.

The square root of 257765243 is about 16055.0690749059. The cubic root of 257765243 is about 636.4165314307.

The spelling of 257765243 in words is "two hundred fifty-seven million, seven hundred sixty-five thousand, two hundred forty-three".