315216805 has 16 divisors (see below), whose sum is σ = 414324720. Its totient is φ = 229153792.

The previous prime is 315216799. The next prime is 315216823. The reversal of 315216805 is 508612513.

It can be written as a sum of positive squares in 8 ways, for example, as 19342404 + 295874401 = 4398^2 + 17201^2 .

It is a cyclic number.

It is not a de Polignac number, because 315216805 - 2⁷ = 315216677 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61474 + ... + 66403.

It is an arithmetic number, because the mean of its divisors is an integer number (25895295).

Almost surely, 2^315216805 is an apocalyptic number.

It is an amenable number.

315216805 is a deficient number, since it is larger than the sum of its proper divisors (99107915).

315216805 is a wasteful number, since it uses less digits than its factorization.

315216805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127928.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 315216805 is about 17754.3460876485. The cubic root of 315216805 is about 680.5652775090.

The spelling of 315216805 in words is "three hundred fifteen million, two hundred sixteen thousand, eight hundred five".