315056561 has 2 divisors, whose sum is σ = 315056562. Its totient is φ = 315056560.

The previous prime is 315056531. The next prime is 315056611. The reversal of 315056561 is 165650513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 314849536 + 207025 = 17744^2 + 455^2 .

It is a cyclic number.

It is not a de Polignac number, because 315056561 - 2²⁶ = 247947697 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (315056501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157528280 + 157528281.

It is an arithmetic number, because the mean of its divisors is an integer number (157528281).

Almost surely, 2^315056561 is an apocalyptic number.

It is an amenable number.

315056561 is a deficient number, since it is larger than the sum of its proper divisors (1).

315056561 is an equidigital number, since it uses as much as digits as its factorization.

315056561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13500, while the sum is 32.

The square root of 315056561 is about 17749.8327034370. The cubic root of 315056561 is about 680.4499336294.

The spelling of 315056561 in words is "three hundred fifteen million, fifty-six thousand, five hundred sixty-one".