12566521 has 8 divisors (see below), whose sum is σ = 13845888. Its totient is φ = 11310000.

The previous prime is 12566509. The next prime is 12566537.

12566521 is nontrivially palindromic in base 10.

12566521 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12566521 - 2¹⁵ = 12533753 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12566521.

It is not an unprimeable number, because it can be changed into a prime (12566551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4545 + ... + 6766.

It is an arithmetic number, because the mean of its divisors is an integer number (1730736).

Almost surely, 2^12566521 is an apocalyptic number.

12566521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12566521 is a deficient number, since it is larger than the sum of its proper divisors (1279367).

12566521 is a wasteful number, since it uses less digits than its factorization.

12566521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11423.

The product of its digits is 3600, while the sum is 28.

The square root of 12566521 is about 3544.9289132506. The cubic root of 12566521 is about 232.4903977227.

It can be divided in two parts, 1256 and 6521, that added together give a palindrome (7777).

The spelling of 12566521 in words is "twelve million, five hundred sixty-six thousand, five hundred twenty-one".