12561136 has 20 divisors (see below), whose sum is σ = 27814192. Its totient is φ = 5383296.

The previous prime is 12561127. The next prime is 12561139. The reversal of 12561136 is 63116521.

It is a super-2 number, since 2×12561136² = 315564275220992, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12561136.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12561139) 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, 55965 + ... + 56188.

Almost surely, 2^12561136 is an apocalyptic number.

12561136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12561136 is an abundant number, since it is smaller than the sum of its proper divisors (15253056).

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

12561136 is a wasteful number, since it uses less digits than its factorization.

12561136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112168 (or 112162 counting only the distinct ones).

The product of its digits is 1080, while the sum is 25.

The square root of 12561136 is about 3544.1692961821. The cubic root of 12561136 is about 232.4571840840.

Adding to 12561136 its reverse (63116521), we get a palindrome (75677657).

The spelling of 12561136 in words is "twelve million, five hundred sixty-one thousand, one hundred thirty-six".