13660509 has 4 divisors (see below), whose sum is σ = 18214016. Its totient is φ = 9107004.

The previous prime is 13660499. The next prime is 13660529. The reversal of 13660509 is 90506631.

It is a happy number.

13660509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 13660509 - 2¹⁵ = 13627741 is a prime.

It is a super-2 number, since 2×13660509² = 373219012278162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13660529) 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, 2276749 + ... + 2276754.

It is an arithmetic number, because the mean of its divisors is an integer number (4553504).

Almost surely, 2^13660509 is an apocalyptic number.

It is an amenable number.

13660509 is a deficient number, since it is larger than the sum of its proper divisors (4553507).

13660509 is an equidigital number, since it uses as much as digits as its factorization.

13660509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4553506.

The product of its (nonzero) digits is 4860, while the sum is 30.

The square root of 13660509 is about 3696.0125811474. The cubic root of 13660509 is about 239.0501169971.

The spelling of 13660509 in words is "thirteen million, six hundred sixty thousand, five hundred nine".