257316251 has 4 divisors (see below), whose sum is σ = 257397504. Its totient is φ = 257235000.

The previous prime is 257316229. The next prime is 257316253. The reversal of 257316251 is 152613752.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 257316251 - 2⁶ = 257316187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257316253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35675 + ... + 42276.

It is an arithmetic number, because the mean of its divisors is an integer number (64349376).

Almost surely, 2^257316251 is an apocalyptic number.

257316251 is a deficient number, since it is larger than the sum of its proper divisors (81253).

257316251 is an equidigital number, since it uses as much as digits as its factorization.

257316251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81252.

The product of its digits is 12600, while the sum is 32.

The square root of 257316251 is about 16041.0801070252. The cubic root of 257316251 is about 636.0467996560.

The spelling of 257316251 in words is "two hundred fifty-seven million, three hundred sixteen thousand, two hundred fifty-one".