316731257 has 4 divisors (see below), whose sum is σ = 316782180. Its totient is φ = 316680336.

The previous prime is 316731221. The next prime is 316731263. The reversal of 316731257 is 752137613.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 752137613 = 17 ⋅44243389.

It can be written as a sum of positive squares in 2 ways, for example, as 184389241 + 132342016 = 13579^2 + 11504^2 .

It is a cyclic number.

It is not a de Polignac number, because 316731257 - 2¹² = 316727161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (316731277) 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 3 ways as a sum of consecutive naturals, for example, 14582 + ... + 29087.

It is an arithmetic number, because the mean of its divisors is an integer number (79195545).

Almost surely, 2^316731257 is an apocalyptic number.

It is an amenable number.

316731257 is a deficient number, since it is larger than the sum of its proper divisors (50923).

316731257 is an equidigital number, since it uses as much as digits as its factorization.

316731257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50922.

The product of its digits is 26460, while the sum is 35.

The square root of 316731257 is about 17796.9451592120. The cubic root of 316731257 is about 681.6534568079.

The spelling of 316731257 in words is "three hundred sixteen million, seven hundred thirty-one thousand, two hundred fifty-seven".