315845609 has 2 divisors, whose sum is σ = 315845610. Its totient is φ = 315845608.

The previous prime is 315845573. The next prime is 315845611. The reversal of 315845609 is 906548513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 247369984 + 68475625 = 15728^2 + 8275^2 .

It is a cyclic number.

It is not a de Polignac number, because 315845609 - 2⁸ = 315845353 is a prime.

Together with 315845611, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (315845659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157922804 + 157922805.

It is an arithmetic number, because the mean of its divisors is an integer number (157922805).

Almost surely, 2^315845609 is an apocalyptic number.

It is an amenable number.

315845609 is a deficient number, since it is larger than the sum of its proper divisors (1).

315845609 is an equidigital number, since it uses as much as digits as its factorization.

315845609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 315845609 is about 17772.0457179245. The cubic root of 315845609 is about 681.0175143183.

The spelling of 315845609 in words is "three hundred fifteen million, eight hundred forty-five thousand, six hundred nine".