12564009 has 6 divisors (see below), whose sum is σ = 18148026. Its totient is φ = 8376000.

The previous prime is 12564007. The next prime is 12564011. The reversal of 12564009 is 90046521.

12564009 is a `hidden beast` number, since 1 + 256 + 400 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (12564007) and next prime (12564011).

It can be written as a sum of positive squares in only one way, i.e., 12425625 + 138384 = 3525^2 + 372^2 .

It is not a de Polignac number, because 12564009 - 2¹ = 12564007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12564001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 697992 + ... + 698009.

It is an arithmetic number, because the mean of its divisors is an integer number (3024671).

Almost surely, 2^12564009 is an apocalyptic number.

It is an amenable number.

12564009 is a deficient number, since it is larger than the sum of its proper divisors (5584017).

12564009 is a wasteful number, since it uses less digits than its factorization.

12564009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1396007 (or 1396004 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 12564009 is about 3544.5745866042. The cubic root of 12564009 is about 232.4749053734.

The spelling of 12564009 in words is "twelve million, five hundred sixty-four thousand, nine".