315665723 has 2 divisors, whose sum is σ = 315665724. Its totient is φ = 315665722.

The previous prime is 315665711. The next prime is 315665761. The reversal of 315665723 is 327566513.

It is an a-pointer prime, because the next prime (315665761) can be obtained adding 315665723 to its sum of digits (38).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-315665723 is a prime.

It is a super-2 number, since 2×315665723² = 199289697354225458, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (315665023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157832861 + 157832862.

It is an arithmetic number, because the mean of its divisors is an integer number (157832862).

Almost surely, 2^315665723 is an apocalyptic number.

315665723 is a deficient number, since it is larger than the sum of its proper divisors (1).

315665723 is an equidigital number, since it uses as much as digits as its factorization.

315665723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 113400, while the sum is 38.

The square root of 315665723 is about 17766.9840715863. The cubic root of 315665723 is about 680.8882013696. Note that the first 3 decimals are identical.

The spelling of 315665723 in words is "three hundred fifteen million, six hundred sixty-five thousand, seven hundred twenty-three".