12556609 has 4 divisors (see below), whose sum is σ = 13522516. Its totient is φ = 11590704.

The previous prime is 12556573. The next prime is 12556613. The reversal of 12556609 is 90665521.

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 7507600 + 5049009 = 2740^2 + 2247^2 .

It is a cyclic number.

It is not a de Polignac number, because 12556609 - 2²³ = 4168001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12556639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 482934 + ... + 482959.

It is an arithmetic number, because the mean of its divisors is an integer number (3380629).

Almost surely, 2^12556609 is an apocalyptic number.

It is an amenable number.

12556609 is a deficient number, since it is larger than the sum of its proper divisors (965907).

12556609 is an equidigital number, since it uses as much as digits as its factorization.

12556609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965906.

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 12556609 is about 3543.5305840362. The cubic root of 12556609 is about 232.4292550783.

The spelling of 12556609 in words is "twelve million, five hundred fifty-six thousand, six hundred nine".