257651493 has 16 divisors (see below), whose sum is σ = 375321600. Its totient is φ = 155920880.

The previous prime is 257651491. The next prime is 257651519. The reversal of 257651493 is 394156752.

It is a cyclic number.

It is not a de Polignac number, because 257651493 - 2¹ = 257651491 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257651491) 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 15 ways as a sum of consecutive naturals, for example, 18298 + ... + 29156.

It is an arithmetic number, because the mean of its divisors is an integer number (23457600).

Almost surely, 2^257651493 is an apocalyptic number.

It is an amenable number.

257651493 is a deficient number, since it is larger than the sum of its proper divisors (117670107).

257651493 is a wasteful number, since it uses less digits than its factorization.

257651493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11592.

The product of its digits is 226800, while the sum is 42.

The square root of 257651493 is about 16051.5261891198. The cubic root of 257651493 is about 636.3229022677.

The spelling of 257651493 in words is "two hundred fifty-seven million, six hundred fifty-one thousand, four hundred ninety-three".