1315540509 has 4 divisors (see below), whose sum is σ = 1754054016. Its totient is φ = 877027004.

The previous prime is 1315540489. The next prime is 1315540517. The reversal of 1315540509 is 9050455131.

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.

It is a cyclic number.

It is not a de Polignac number, because 1315540509 - 2⁵ = 1315540477 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1315540509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1315540909) 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, 219256749 + ... + 219256754.

It is an arithmetic number, because the mean of its divisors is an integer number (438513504).

Almost surely, 2^1315540509 is an apocalyptic number.

It is an amenable number.

1315540509 is a deficient number, since it is larger than the sum of its proper divisors (438513507).

1315540509 is an equidigital number, since it uses as much as digits as its factorization.

1315540509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438513506.

The product of its (nonzero) digits is 13500, while the sum is 33.

The square root of 1315540509 is about 36270.3806018079. The cubic root of 1315540509 is about 1095.7245911993.

The spelling of 1315540509 in words is "one billion, three hundred fifteen million, five hundred forty thousand, five hundred nine".