315620729 has 2 divisors, whose sum is σ = 315620730. Its totient is φ = 315620728.

The previous prime is 315620713. The next prime is 315620779. The reversal of 315620729 is 927026513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 301543225 + 14077504 = 17365^2 + 3752^2 .

It is a cyclic number.

It is not a de Polignac number, because 315620729 - 2⁴ = 315620713 is a prime.

It is not a weakly prime, because it can be changed into another prime (315620779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157810364 + 157810365.

It is an arithmetic number, because the mean of its divisors is an integer number (157810365).

Almost surely, 2^315620729 is an apocalyptic number.

It is an amenable number.

315620729 is a deficient number, since it is larger than the sum of its proper divisors (1).

315620729 is an equidigital number, since it uses as much as digits as its factorization.

315620729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 315620729 is about 17765.7178014287. The cubic root of 315620729 is about 680.8558492777.

The spelling of 315620729 in words is "three hundred fifteen million, six hundred twenty thousand, seven hundred twenty-nine".