12605561 has 4 divisors (see below), whose sum is σ = 13012224. Its totient is φ = 12198900.

The previous prime is 12605557. The next prime is 12605591. The reversal of 12605561 is 16550621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12605561 - 2² = 12605557 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12605561.

It is not an unprimeable number, because it can be changed into a prime (12605591) 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, 203285 + ... + 203346.

It is an arithmetic number, because the mean of its divisors is an integer number (3253056).

Almost surely, 2^12605561 is an apocalyptic number.

It is an amenable number.

12605561 is a deficient number, since it is larger than the sum of its proper divisors (406663).

12605561 is an equidigital number, since it uses as much as digits as its factorization.

12605561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406662.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 12605561 is about 3550.4311005848. The cubic root of 12605561 is about 232.7309056079.

The spelling of 12605561 in words is "twelve million, six hundred five thousand, five hundred sixty-one".