13508709 has 4 divisors (see below), whose sum is σ = 18011616. Its totient is φ = 9005804.

The previous prime is 13508701. The next prime is 13508731. The reversal of 13508709 is 90780531.

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 13508709 - 2³ = 13508701 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13508709.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13508701) 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, 2251449 + ... + 2251454.

It is an arithmetic number, because the mean of its divisors is an integer number (4502904).

Almost surely, 2^13508709 is an apocalyptic number.

It is an amenable number.

13508709 is a deficient number, since it is larger than the sum of its proper divisors (4502907).

13508709 is an equidigital number, since it uses as much as digits as its factorization.

13508709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4502906.

The product of its (nonzero) digits is 7560, while the sum is 33.

The square root of 13508709 is about 3675.4195678861. The cubic root of 13508709 is about 238.1613492916.

The spelling of 13508709 in words is "thirteen million, five hundred eight thousand, seven hundred nine".