315897209 has 2 divisors, whose sum is σ = 315897210. Its totient is φ = 315897208.

The previous prime is 315897193. The next prime is 315897217. The reversal of 315897209 is 902798513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 269616400 + 46280809 = 16420^2 + 6803^2 .

It is a cyclic number.

It is not a de Polignac number, because 315897209 - 2⁴ = 315897193 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 315897209.

It is not a weakly prime, because it can be changed into another prime (315897299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157948604 + 157948605.

It is an arithmetic number, because the mean of its divisors is an integer number (157948605).

Almost surely, 2^315897209 is an apocalyptic number.

It is an amenable number.

315897209 is a deficient number, since it is larger than the sum of its proper divisors (1).

315897209 is an equidigital number, since it uses as much as digits as its factorization.

315897209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 136080, while the sum is 44.

The square root of 315897209 is about 17773.4973767123. The cubic root of 315897209 is about 681.0545984603.

The spelling of 315897209 in words is "three hundred fifteen million, eight hundred ninety-seven thousand, two hundred nine".