13509609 has 8 divisors (see below), whose sum is σ = 18308352. Its totient is φ = 8858640.

The previous prime is 13509607. The next prime is 13509619. The reversal of 13509609 is 90690531.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13509609 - 2¹ = 13509607 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 13509609.

It is not an unprimeable number, because it can be changed into a prime (13509607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36729 + ... + 37094.

It is an arithmetic number, because the mean of its divisors is an integer number (2288544).

Almost surely, 2^13509609 is an apocalyptic number.

It is an amenable number.

13509609 is a deficient number, since it is larger than the sum of its proper divisors (4798743).

13509609 is an equidigital number, since it uses as much as digits as its factorization.

13509609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73887.

The product of its (nonzero) digits is 7290, while the sum is 33.

The square root of 13509609 is about 3675.5420008483. The cubic root of 13509609 is about 238.1666382365.

The spelling of 13509609 in words is "thirteen million, five hundred nine thousand, six hundred nine".