12255561 has 12 divisors (see below), whose sum is σ = 18037188. Its totient is φ = 8015904.

The previous prime is 12255533. The next prime is 12255587. The reversal of 12255561 is 16555221.

12255561 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 9960336 + 2295225 = 3156^2 + 1515^2 .

It is not a de Polignac number, because 12255561 - 2¹⁰ = 12254537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12255511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12370 + ... + 13323.

It is an arithmetic number, because the mean of its divisors is an integer number (1503099).

Almost surely, 2^12255561 is an apocalyptic number.

It is an amenable number.

12255561 is a deficient number, since it is larger than the sum of its proper divisors (5781627).

12255561 is a wasteful number, since it uses less digits than its factorization.

12255561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25752 (or 25749 counting only the distinct ones).

The product of its digits is 3000, while the sum is 27.

The square root of 12255561 is about 3500.7943384324. The cubic root of 12255561 is about 230.5566918241.

It can be divided in two parts, 1225 and 5561, that added together give a triangular number (6786 = T₁₁₆).

The spelling of 12255561 in words is "twelve million, two hundred fifty-five thousand, five hundred sixty-one".