2015091609 has 4 divisors (see below), whose sum is σ = 2686788816. Its totient is φ = 1343394404.

The previous prime is 2015091599. The next prime is 2015091613. The reversal of 2015091609 is 9061905102.

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 2015091609 - 2²⁵ = 1981537177 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2015091609.

It is not an unprimeable number, because it can be changed into a prime (2015091619) 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, 335848599 + ... + 335848604.

It is an arithmetic number, because the mean of its divisors is an integer number (671697204).

Almost surely, 2^2015091609 is an apocalyptic number.

It is an amenable number.

2015091609 is a deficient number, since it is larger than the sum of its proper divisors (671697207).

2015091609 is an equidigital number, since it uses as much as digits as its factorization.

2015091609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671697206.

The product of its (nonzero) digits is 4860, while the sum is 33.

The square root of 2015091609 is about 44889.7717637325. The cubic root of 2015091609 is about 1263.0821514686.

The spelling of 2015091609 in words is "two billion, fifteen million, ninety-one thousand, six hundred nine".