13509509 has 8 divisors (see below), whose sum is σ = 15404760. Its totient is φ = 11736576.

The previous prime is 13509497. The next prime is 13509511. The reversal of 13509509 is 90590531.

13509509 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 77284 + 13432225 = 278^2 + 3665^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 13509509 - 2⁸ = 13509253 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 (13509109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30344 + ... + 30785.

It is an arithmetic number, because the mean of its divisors is an integer number (1925595).

Almost surely, 2^13509509 is an apocalyptic number.

It is an amenable number.

13509509 is a deficient number, since it is larger than the sum of its proper divisors (1895251).

13509509 is a wasteful number, since it uses less digits than its factorization.

13509509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61159.

The product of its (nonzero) digits is 6075, while the sum is 32.

The square root of 13509509 is about 3675.5283973872. The cubic root of 13509509 is about 238.1660505876.

The spelling of 13509509 in words is "thirteen million, five hundred nine thousand, five hundred nine".