257437013 has 4 divisors (see below), whose sum is σ = 258978720. Its totient is φ = 255895308.

The previous prime is 257437003. The next prime is 257437027. The reversal of 257437013 is 310734752.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 257437013 - 2²² = 253242709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257437003) 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, 770603 + ... + 770936.

It is an arithmetic number, because the mean of its divisors is an integer number (64744680).

Almost surely, 2^257437013 is an apocalyptic number.

It is an amenable number.

257437013 is a deficient number, since it is larger than the sum of its proper divisors (1541707).

257437013 is a wasteful number, since it uses less digits than its factorization.

257437013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1541706.

The product of its (nonzero) digits is 17640, while the sum is 32.

The square root of 257437013 is about 16044.8438135122. The cubic root of 257437013 is about 636.1462858854.

The spelling of 257437013 in words is "two hundred fifty-seven million, four hundred thirty-seven thousand, thirteen".