257572369 has 2 divisors, whose sum is σ = 257572370. Its totient is φ = 257572368.

The previous prime is 257572363. The next prime is 257572387. The reversal of 257572369 is 963275752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 151585344 + 105987025 = 12312^2 + 10295^2 .

It is a cyclic number.

It is not a de Polignac number, because 257572369 - 2⁷ = 257572241 is a prime.

It is a super-2 number, since 2×257572369² = 132687050544544322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (257572363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128786184 + 128786185.

It is an arithmetic number, because the mean of its divisors is an integer number (128786185).

Almost surely, 2^257572369 is an apocalyptic number.

It is an amenable number.

257572369 is a deficient number, since it is larger than the sum of its proper divisors (1).

257572369 is an equidigital number, since it uses as much as digits as its factorization.

257572369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 793800, while the sum is 46.

The square root of 257572369 is about 16049.0613121142. The cubic root of 257572369 is about 636.2577579811.

The spelling of 257572369 in words is "two hundred fifty-seven million, five hundred seventy-two thousand, three hundred sixty-nine".