313740257 has 2 divisors, whose sum is σ = 313740258. Its totient is φ = 313740256.

The previous prime is 313740247. The next prime is 313740269. The reversal of 313740257 is 752047313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 249355681 + 64384576 = 15791^2 + 8024^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-313740257 is a prime.

It is not a weakly prime, because it can be changed into another prime (313740227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156870128 + 156870129.

It is an arithmetic number, because the mean of its divisors is an integer number (156870129).

Almost surely, 2^313740257 is an apocalyptic number.

It is an amenable number.

313740257 is a deficient number, since it is larger than the sum of its proper divisors (1).

313740257 is an equidigital number, since it uses as much as digits as its factorization.

313740257 is an odious number, because the sum of its binary digits is odd.

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

The square root of 313740257 is about 17712.7145576278. The cubic root of 313740257 is about 679.5009725392.

The spelling of 313740257 in words is "three hundred thirteen million, seven hundred forty thousand, two hundred fifty-seven".