12544561 has 4 divisors (see below), whose sum is σ = 12580452. Its totient is φ = 12508672.

The previous prime is 12544549. The next prime is 12544577. The reversal of 12544561 is 16544521.

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 7840000 + 4704561 = 2800^2 + 2169^2 .

It is a cyclic number.

It is not a de Polignac number, because 12544561 - 2⁵ = 12544529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12541561) 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, 17416 + ... + 18121.

It is an arithmetic number, because the mean of its divisors is an integer number (3145113).

Almost surely, 2^12544561 is an apocalyptic number.

It is an amenable number.

12544561 is a deficient number, since it is larger than the sum of its proper divisors (35891).

12544561 is an equidigital number, since it uses as much as digits as its factorization.

12544561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35890.

The product of its digits is 4800, while the sum is 28.

The square root of 12544561 is about 3541.8301766177. The cubic root of 12544561 is about 232.3548930758.

The spelling of 12544561 in words is "twelve million, five hundred forty-four thousand, five hundred sixty-one".