12564621 has 6 divisors (see below), whose sum is σ = 18148910. Its totient is φ = 8376408.

The previous prime is 12564613. The next prime is 12564631. The reversal of 12564621 is 12646521.

12564621 is a `hidden beast` number, since 12 + 5 + 646 + 2 + 1 = 666.

12564621 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 7502121 + 5062500 = 2739^2 + 2250^2 .

It is not a de Polignac number, because 12564621 - 2³ = 12564613 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 (12564631) 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, 698026 + ... + 698043.

Almost surely, 2^12564621 is an apocalyptic number.

It is an amenable number.

12564621 is a deficient number, since it is larger than the sum of its proper divisors (5584289).

12564621 is a wasteful number, since it uses less digits than its factorization.

12564621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1396075 (or 1396072 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 12564621 is about 3544.6609146715. The cubic root of 12564621 is about 232.4786799736.

It can be divided in two parts, 125 and 64621, that added together give a palindrome (64746).

The spelling of 12564621 in words is "twelve million, five hundred sixty-four thousand, six hundred twenty-one".