257931291 has 4 divisors (see below), whose sum is σ = 343908392. Its totient is φ = 171954192.

The previous prime is 257931283. The next prime is 257931301. The reversal of 257931291 is 192139752.

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

It is not a de Polignac number, because 257931291 - 2³ = 257931283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257931391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42988546 + ... + 42988551.

It is an arithmetic number, because the mean of its divisors is an integer number (85977098).

Almost surely, 2^257931291 is an apocalyptic number.

257931291 is a deficient number, since it is larger than the sum of its proper divisors (85977101).

257931291 is an equidigital number, since it uses as much as digits as its factorization.

257931291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85977100.

The product of its digits is 34020, while the sum is 39.

The square root of 257931291 is about 16060.2394440432. The cubic root of 257931291 is about 636.5531583444.

The spelling of 257931291 in words is "two hundred fifty-seven million, nine hundred thirty-one thousand, two hundred ninety-one".