12561611 has 16 divisors (see below), whose sum is σ = 13953600. Its totient is φ = 11265408.

The previous prime is 12561599. The next prime is 12561671. The reversal of 12561611 is 11616521.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12561611 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12561671) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24425 + ... + 24933.

It is an arithmetic number, because the mean of its divisors is an integer number (872100).

Almost surely, 2^12561611 is an apocalyptic number.

12561611 is a deficient number, since it is larger than the sum of its proper divisors (1391989).

12561611 is a wasteful number, since it uses less digits than its factorization.

12561611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 598.

The product of its digits is 360, while the sum is 23.

The square root of 12561611 is about 3544.2363070202. The cubic root of 12561611 is about 232.4601141738.

The spelling of 12561611 in words is "twelve million, five hundred sixty-one thousand, six hundred eleven".