13608109 has 4 divisors (see below), whose sum is σ = 14408604. Its totient is φ = 12807616.

The previous prime is 13608107. The next prime is 13608113. The reversal of 13608109 is 90180631.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3861225 + 9746884 = 1965^2 + 3122^2 .

It is a cyclic number.

It is not a de Polignac number, because 13608109 - 2¹ = 13608107 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 (13608103) 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, 400222 + ... + 400255.

It is an arithmetic number, because the mean of its divisors is an integer number (3602151).

Almost surely, 2^13608109 is an apocalyptic number.

It is an amenable number.

13608109 is a deficient number, since it is larger than the sum of its proper divisors (800495).

13608109 is an equidigital number, since it uses as much as digits as its factorization.

13608109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800494.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 13608109 is about 3688.9170497586. The cubic root of 13608109 is about 238.7440699166.

The spelling of 13608109 in words is "thirteen million, six hundred eight thousand, one hundred nine".