315722989 has 2 divisors, whose sum is σ = 315722990. Its totient is φ = 315722988.

The previous prime is 315722977. The next prime is 315723011. The reversal of 315722989 is 989227513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 206353225 + 109369764 = 14365^2 + 10458^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-315722989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315722959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157861494 + 157861495.

It is an arithmetic number, because the mean of its divisors is an integer number (157861495).

Almost surely, 2^315722989 is an apocalyptic number.

It is an amenable number.

315722989 is a deficient number, since it is larger than the sum of its proper divisors (1).

315722989 is an equidigital number, since it uses as much as digits as its factorization.

315722989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 46.

The square root of 315722989 is about 17768.5955832193. The cubic root of 315722989 is about 680.9293729669.

The spelling of 315722989 in words is "three hundred fifteen million, seven hundred twenty-two thousand, nine hundred eighty-nine".