13509009 has 24 divisors (see below), whose sum is σ = 20303712. Its totient is φ = 8648640.

The previous prime is 13508987. The next prime is 13509031. The reversal of 13509009 is 90090531.

It is an interprime number because it is at equal distance from previous prime (13508987) and next prime (13509031).

It is not a de Polignac number, because 13509009 - 2⁵ = 13508977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13509059) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25669 + ... + 26189.

It is an arithmetic number, because the mean of its divisors is an integer number (845988).

Almost surely, 2^13509009 is an apocalyptic number.

It is an amenable number.

13509009 is a deficient number, since it is larger than the sum of its proper divisors (6794703).

13509009 is a wasteful number, since it uses less digits than its factorization.

13509009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637 (or 634 counting only the distinct ones).

The product of its (nonzero) digits is 1215, while the sum is 27.

The square root of 13509009 is about 3675.4603793266. The cubic root of 13509009 is about 238.1631122993.

The spelling of 13509009 in words is "thirteen million, five hundred nine thousand, nine".