257043313 has 4 divisors (see below), whose sum is σ = 258020928. Its totient is φ = 256065700.

The previous prime is 257043299. The next prime is 257043323. The reversal of 257043313 is 313340752.

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 257043313 - 2⁹ = 257042801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257043323) 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, 488413 + ... + 488938.

It is an arithmetic number, because the mean of its divisors is an integer number (64505232).

Almost surely, 2^257043313 is an apocalyptic number.

It is an amenable number.

257043313 is a deficient number, since it is larger than the sum of its proper divisors (977615).

257043313 is an equidigital number, since it uses as much as digits as its factorization.

257043313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 977614.

The product of its (nonzero) digits is 7560, while the sum is 28.

The square root of 257043313 is about 16032.5703803227. The cubic root of 257043313 is about 635.8218329634.

The spelling of 257043313 in words is "two hundred fifty-seven million, forty-three thousand, three hundred thirteen".