257886313 has 4 divisors (see below), whose sum is σ = 257938560. Its totient is φ = 257834068.

The previous prime is 257886253. The next prime is 257886323. The reversal of 257886313 is 313688752.

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 257886313 - 2²¹ = 255789161 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 257886313.

It is not an unprimeable number, because it can be changed into a prime (257886323) 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, 17845 + ... + 28882.

It is an arithmetic number, because the mean of its divisors is an integer number (64484640).

Almost surely, 2^257886313 is an apocalyptic number.

It is an amenable number.

257886313 is a deficient number, since it is larger than the sum of its proper divisors (52247).

257886313 is an equidigital number, since it uses as much as digits as its factorization.

257886313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52246.

The product of its digits is 241920, while the sum is 43.

The square root of 257886313 is about 16058.8390925372. The cubic root of 257886313 is about 636.5161555283.

The spelling of 257886313 in words is "two hundred fifty-seven million, eight hundred eighty-six thousand, three hundred thirteen".