257703491 has 8 divisors (see below), whose sum is σ = 269607744. Its totient is φ = 246066880.

The previous prime is 257703487. The next prime is 257703497. The reversal of 257703491 is 194307752.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 257703491 - 2² = 257703487 is a prime.

It is a super-2 number, since 2×257703491² = 132822178547174162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257703497) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64940 + ... + 68793.

It is an arithmetic number, because the mean of its divisors is an integer number (33700968).

Almost surely, 2^257703491 is an apocalyptic number.

257703491 is a deficient number, since it is larger than the sum of its proper divisors (11904253).

257703491 is a wasteful number, since it uses less digits than its factorization.

257703491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133821.

The product of its (nonzero) digits is 52920, while the sum is 38.

The square root of 257703491 is about 16053.1458287776. The cubic root of 257703491 is about 636.3657059432.

The spelling of 257703491 in words is "two hundred fifty-seven million, seven hundred three thousand, four hundred ninety-one".