315704621 has 2 divisors, whose sum is σ = 315704622. Its totient is φ = 315704620.

The previous prime is 315704591. The next prime is 315704659. The reversal of 315704621 is 126407513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 190578025 + 125126596 = 13805^2 + 11186^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-315704621 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p_17056073 and since 315704621 and 17056073 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315704021) 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, 157852310 + 157852311.

It is an arithmetic number, because the mean of its divisors is an integer number (157852311).

Almost surely, 2^315704621 is an apocalyptic number.

It is an amenable number.

315704621 is a deficient number, since it is larger than the sum of its proper divisors (1).

315704621 is an equidigital number, since it uses as much as digits as its factorization.

315704621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 315704621 is about 17768.0787087406. The cubic root of 315704621 is about 680.9161677694.

The spelling of 315704621 in words is "three hundred fifteen million, seven hundred four thousand, six hundred twenty-one".