1315373509 has 4 divisors (see below), whose sum is σ = 1315456704. Its totient is φ = 1315290316.

The previous prime is 1315373497. The next prime is 1315373581. The reversal of 1315373509 is 9053735131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1315373509 - 2¹¹ = 1315371461 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 (1315373599) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9757 + ... + 52210.

It is an arithmetic number, because the mean of its divisors is an integer number (328864176).

Almost surely, 2^1315373509 is an apocalyptic number.

It is an amenable number.

1315373509 is a deficient number, since it is larger than the sum of its proper divisors (83195).

1315373509 is an equidigital number, since it uses as much as digits as its factorization.

1315373509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83194.

The product of its (nonzero) digits is 42525, while the sum is 37.

The square root of 1315373509 is about 36268.0783747912. The cubic root of 1315373509 is about 1095.6782240093.

The spelling of 1315373509 in words is "one billion, three hundred fifteen million, three hundred seventy-three thousand, five hundred nine".