1315657917 has 16 divisors (see below), whose sum is σ = 2227569280. Its totient is φ = 751804416.

The previous prime is 1315657879. The next prime is 1315657919. The reversal of 1315657917 is 7197565131.

1315657917 is a `hidden beast` number, since 1 + 3 + 1 + 565 + 79 + 17 = 666.

It is not a de Polignac number, because 1315657917 - 2⁷ = 1315657789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1315657919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3480388 + ... + 3480765.

It is an arithmetic number, because the mean of its divisors is an integer number (139223080).

Almost surely, 2^1315657917 is an apocalyptic number.

It is an amenable number.

1315657917 is a deficient number, since it is larger than the sum of its proper divisors (911911363).

1315657917 is an equidigital number, since it uses as much as digits as its factorization.

1315657917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6961169 (or 6961163 counting only the distinct ones).

The product of its digits is 198450, while the sum is 45.

The square root of 1315657917 is about 36271.9990764226. Note that the first 3 decimals coincide. The cubic root of 1315657917 is about 1095.7571869283.

The spelling of 1315657917 in words is "one billion, three hundred fifteen million, six hundred fifty-seven thousand, nine hundred seventeen".