315023561 has 2 divisors, whose sum is σ = 315023562. Its totient is φ = 315023560.

The previous prime is 315023557. The next prime is 315023641. The reversal of 315023561 is 165320513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 231648400 + 83375161 = 15220^2 + 9131^2 .

It is a cyclic number.

It is not a de Polignac number, because 315023561 - 2² = 315023557 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 315023561.

It is not a weakly prime, because it can be changed into another prime (315023531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157511780 + 157511781.

It is an arithmetic number, because the mean of its divisors is an integer number (157511781).

Almost surely, 2^315023561 is an apocalyptic number.

It is an amenable number.

315023561 is a deficient number, since it is larger than the sum of its proper divisors (1).

315023561 is an equidigital number, since it uses as much as digits as its factorization.

315023561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 315023561 is about 17748.9030928675. The cubic root of 315023561 is about 680.4261753221.

The spelling of 315023561 in words is "three hundred fifteen million, twenty-three thousand, five hundred sixty-one".