315631913 has 2 divisors, whose sum is σ = 315631914. Its totient is φ = 315631912.

The previous prime is 315631891. The next prime is 315631949. The reversal of 315631913 is 319136513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 252079129 + 63552784 = 15877^2 + 7972^2 .

It is a cyclic number.

It is not a de Polignac number, because 315631913 - 2¹² = 315627817 is a prime.

It is a super-3 number, since 3×315631913³ (a number of 26 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 315631913.

It is not a weakly prime, because it can be changed into another prime (315631973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157815956 + 157815957.

It is an arithmetic number, because the mean of its divisors is an integer number (157815957).

Almost surely, 2^315631913 is an apocalyptic number.

It is an amenable number.

315631913 is a deficient number, since it is larger than the sum of its proper divisors (1).

315631913 is an equidigital number, since it uses as much as digits as its factorization.

315631913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7290, while the sum is 32.

The square root of 315631913 is about 17766.0325621676. The cubic root of 315631913 is about 680.8638912103.

The spelling of 315631913 in words is "three hundred fifteen million, six hundred thirty-one thousand, nine hundred thirteen".