316118521 has 2 divisors, whose sum is σ = 316118522. Its totient is φ = 316118520.

The previous prime is 316118507. The next prime is 316118567. The reversal of 316118521 is 125811613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210830400 + 105288121 = 14520^2 + 10261^2 .

It is an emirp because it is prime and its reverse (125811613) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 316118521 - 2⁵ = 316118489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 316118521.

It is not a weakly prime, because it can be changed into another prime (316118581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158059260 + 158059261.

It is an arithmetic number, because the mean of its divisors is an integer number (158059261).

Almost surely, 2^316118521 is an apocalyptic number.

It is an amenable number.

316118521 is a deficient number, since it is larger than the sum of its proper divisors (1).

316118521 is an equidigital number, since it uses as much as digits as its factorization.

316118521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 28.

The square root of 316118521 is about 17779.7221856811. The cubic root of 316118521 is about 681.2136062706.

The spelling of 316118521 in words is "three hundred sixteen million, one hundred eighteen thousand, five hundred twenty-one".