313116521 has 2 divisors, whose sum is σ = 313116522. Its totient is φ = 313116520.

The previous prime is 313116511. The next prime is 313116539. The reversal of 313116521 is 125611313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 311028496 + 2088025 = 17636^2 + 1445^2 .

It is a cyclic number.

It is not a de Polignac number, because 313116521 - 2²² = 308922217 is a prime.

It is not a weakly prime, because it can be changed into another prime (313116511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156558260 + 156558261.

It is an arithmetic number, because the mean of its divisors is an integer number (156558261).

Almost surely, 2^313116521 is an apocalyptic number.

It is an amenable number.

313116521 is a deficient number, since it is larger than the sum of its proper divisors (1).

313116521 is an equidigital number, since it uses as much as digits as its factorization.

313116521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 540, while the sum is 23.

The square root of 313116521 is about 17695.0987846918. The cubic root of 313116521 is about 679.0503764527.

Adding to 313116521 its reverse (125611313), we get a palindrome (438727834).

The spelling of 313116521 in words is "three hundred thirteen million, one hundred sixteen thousand, five hundred twenty-one".