257431917 has 16 divisors (see below), whose sum is σ = 348416640. Its totient is φ = 169052352.

The previous prime is 257431913. The next prime is 257431961. The reversal of 257431917 is 719134752.

It is not a de Polignac number, because 257431917 - 2² = 257431913 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257431913) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58759 + ... + 62987.

It is an arithmetic number, because the mean of its divisors is an integer number (21776040).

Almost surely, 2^257431917 is an apocalyptic number.

It is an amenable number.

257431917 is a deficient number, since it is larger than the sum of its proper divisors (90984723).

257431917 is a wasteful number, since it uses less digits than its factorization.

257431917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4532.

The product of its digits is 52920, while the sum is 39.

The square root of 257431917 is about 16044.6850078149. The cubic root of 257431917 is about 636.1420883242.

The spelling of 257431917 in words is "two hundred fifty-seven million, four hundred thirty-one thousand, nine hundred seventeen".