315649517 has 2 divisors, whose sum is σ = 315649518. Its totient is φ = 315649516.

The previous prime is 315649511. The next prime is 315649519. The reversal of 315649517 is 715946513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 299601481 + 16048036 = 17309^2 + 4006^2 .

It is an emirp because it is prime and its reverse (715946513) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 315649517 - 2¹⁰ = 315648493 is a prime.

Together with 315649519, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315649511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157824758 + 157824759.

It is an arithmetic number, because the mean of its divisors is an integer number (157824759).

Almost surely, 2^315649517 is an apocalyptic number.

It is an amenable number.

315649517 is a deficient number, since it is larger than the sum of its proper divisors (1).

315649517 is an equidigital number, since it uses as much as digits as its factorization.

315649517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 113400, while the sum is 41.

The square root of 315649517 is about 17766.5279950811. The cubic root of 315649517 is about 680.8765491035.

The spelling of 315649517 in words is "three hundred fifteen million, six hundred forty-nine thousand, five hundred seventeen".