315765217 has 2 divisors, whose sum is σ = 315765218. Its totient is φ = 315765216.

The previous prime is 315765181. The next prime is 315765277. The reversal of 315765217 is 712567513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 230553856 + 85211361 = 15184^2 + 9231^2 .

It is a cyclic number.

It is not a de Polignac number, because 315765217 - 2¹¹ = 315763169 is a prime.

It is not a weakly prime, because it can be changed into another prime (315765277) 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, 157882608 + 157882609.

It is an arithmetic number, because the mean of its divisors is an integer number (157882609).

Almost surely, 2^315765217 is an apocalyptic number.

It is an amenable number.

315765217 is a deficient number, since it is larger than the sum of its proper divisors (1).

315765217 is an equidigital number, since it uses as much as digits as its factorization.

315765217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 44100, while the sum is 37.

The square root of 315765217 is about 17769.7838197317. The cubic root of 315765217 is about 680.9597297508.

The spelling of 315765217 in words is "three hundred fifteen million, seven hundred sixty-five thousand, two hundred seventeen".