12561144 has 32 divisors (see below), whose sum is σ = 31557120. Its totient is φ = 4166496.

The previous prime is 12561139. The next prime is 12561163. The reversal of 12561144 is 44116521.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4179 + ... + 6525.

It is an arithmetic number, because the mean of its divisors is an integer number (986160).

Almost surely, 2^12561144 is an apocalyptic number.

It is an amenable number.

12561144 is an abundant number, since it is smaller than the sum of its proper divisors (18995976).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12561144 is a wasteful number, since it uses less digits than its factorization.

12561144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2579 (or 2575 counting only the distinct ones).

The product of its digits is 960, while the sum is 24.

The square root of 12561144 is about 3544.1704247962. The cubic root of 12561144 is about 232.4572334335.

Adding to 12561144 its reverse (44116521), we get a palindrome (56677665).

The spelling of 12561144 in words is "twelve million, five hundred sixty-one thousand, one hundred forty-four".