316516561 has 2 divisors, whose sum is σ = 316516562. Its totient is φ = 316516560.

The previous prime is 316516513. The next prime is 316516601. The reversal of 316516561 is 165615613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 310852161 + 5664400 = 17631^2 + 2380^2 .

It is a cyclic number.

It is not a de Polignac number, because 316516561 - 2¹³ = 316508369 is a prime.

It is not a weakly prime, because it can be changed into another prime (316516261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158258280 + 158258281.

It is an arithmetic number, because the mean of its divisors is an integer number (158258281).

Almost surely, 2^316516561 is an apocalyptic number.

It is an amenable number.

316516561 is a deficient number, since it is larger than the sum of its proper divisors (1).

316516561 is an equidigital number, since it uses as much as digits as its factorization.

316516561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16200, while the sum is 34.

The square root of 316516561 is about 17790.9123149995. The cubic root of 316516561 is about 681.4994025983.

The spelling of 316516561 in words is "three hundred sixteen million, five hundred sixteen thousand, five hundred sixty-one".