12618609 has 4 divisors (see below), whose sum is σ = 16824816. Its totient is φ = 8412404.

The previous prime is 12618601. The next prime is 12618623. The reversal of 12618609 is 90681621.

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 12618609 - 2³ = 12618601 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12618609.

It is not an unprimeable number, because it can be changed into a prime (12618601) 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, 2103099 + ... + 2103104.

It is an arithmetic number, because the mean of its divisors is an integer number (4206204).

Almost surely, 2^12618609 is an apocalyptic number.

It is an amenable number.

12618609 is a deficient number, since it is larger than the sum of its proper divisors (4206207).

12618609 is an equidigital number, since it uses as much as digits as its factorization.

12618609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4206206.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 12618609 is about 3552.2681486622. The cubic root of 12618609 is about 232.8111777382.

It can be divided in two parts, 1261 and 8609, that added together give a triangular number (9870 = T₁₄₀).

The spelling of 12618609 in words is "twelve million, six hundred eighteen thousand, six hundred nine".