12561912 has 128 divisors (see below), whose sum is σ = 40435200. Its totient is φ = 3571200.

The previous prime is 12561911. The next prime is 12561917. The reversal of 12561912 is 21916521.

12561912 is a `hidden beast` number, since 12 + 561 + 91 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12561911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40237 + ... + 40547.

It is an arithmetic number, because the mean of its divisors is an integer number (315900).

Almost surely, 2^12561912 is an apocalyptic number.

12561912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12561912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20217600).

12561912 is an abundant number, since it is smaller than the sum of its proper divisors (27873288).

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

12561912 is a wasteful number, since it uses less digits than its factorization.

12561912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354 (or 344 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 12561912 is about 3544.2787700744. The cubic root of 12561912 is about 232.4619708872.

The spelling of 12561912 in words is "twelve million, five hundred sixty-one thousand, nine hundred twelve".