315999989 has 2 divisors, whose sum is σ = 315999990. Its totient is φ = 315999988.

The previous prime is 315999973. The next prime is 316000031. The reversal of 315999989 is 989999513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 257859364 + 58140625 = 16058^2 + 7625^2 .

It is a cyclic number.

It is not a de Polignac number, because 315999989 - 2⁴ = 315999973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315999919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157999994 + 157999995.

It is an arithmetic number, because the mean of its divisors is an integer number (157999995).

Almost surely, 2^315999989 is an apocalyptic number.

It is an amenable number.

315999989 is a deficient number, since it is larger than the sum of its proper divisors (1).

315999989 is an equidigital number, since it uses as much as digits as its factorization.

315999989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7085880, while the sum is 62.

The square root of 315999989 is about 17776.3885252320. The cubic root of 315999989 is about 681.1284528655.

The spelling of 315999989 in words is "three hundred fifteen million, nine hundred ninety-nine thousand, nine hundred eighty-nine".