315123517 has 2 divisors, whose sum is σ = 315123518. Its totient is φ = 315123516.

The previous prime is 315123511. The next prime is 315123559. The reversal of 315123517 is 715321513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 204747481 + 110376036 = 14309^2 + 10506^2 .

It is an emirp because it is prime and its reverse (715321513) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-315123517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315123511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157561758 + 157561759.

It is an arithmetic number, because the mean of its divisors is an integer number (157561759).

Almost surely, 2^315123517 is an apocalyptic number.

It is an amenable number.

315123517 is a deficient number, since it is larger than the sum of its proper divisors (1).

315123517 is an equidigital number, since it uses as much as digits as its factorization.

315123517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3150, while the sum is 28.

The square root of 315123517 is about 17751.7187055226. The cubic root of 315123517 is about 680.4981334178.

The spelling of 315123517 in words is "three hundred fifteen million, one hundred twenty-three thousand, five hundred seventeen".