1315525399 has 12 divisors (see below), whose sum is σ = 1400779600. Its totient is φ = 1235202048.

The previous prime is 1315525381. The next prime is 1315525403. The reversal of 1315525399 is 9935255131.

It is not a de Polignac number, because 1315525399 - 2⁹ = 1315524887 is a prime.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1315525339) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 121687 + ... + 132055.

Almost surely, 2^1315525399 is an apocalyptic number.

1315525399 is a deficient number, since it is larger than the sum of its proper divisors (85254201).

1315525399 is a wasteful number, since it uses less digits than its factorization.

1315525399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10842 (or 10825 counting only the distinct ones).

The product of its digits is 182250, while the sum is 43.

The square root of 1315525399 is about 36270.1723045259. The cubic root of 1315525399 is about 1095.7203961018.

The spelling of 1315525399 in words is "one billion, three hundred fifteen million, five hundred twenty-five thousand, three hundred ninety-nine".