1315909109 has 4 divisors (see below), whose sum is σ = 1320140640. Its totient is φ = 1311677580.

The previous prime is 1315909099. The next prime is 1315909117. The reversal of 1315909109 is 9019095131.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-1315909109 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 (1315909139) 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, 2115299 + ... + 2115920.

It is an arithmetic number, because the mean of its divisors is an integer number (330035160).

Almost surely, 2^1315909109 is an apocalyptic number.

It is an amenable number.

1315909109 is a deficient number, since it is larger than the sum of its proper divisors (4231531).

1315909109 is an equidigital number, since it uses as much as digits as its factorization.

1315909109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4231530.

The product of its (nonzero) digits is 10935, while the sum is 38.

The square root of 1315909109 is about 36275.4615270433. The cubic root of 1315909109 is about 1095.8269183077.

The spelling of 1315909109 in words is "one billion, three hundred fifteen million, nine hundred nine thousand, one hundred nine".