12208561 has 4 divisors (see below), whose sum is σ = 12739392. Its totient is φ = 11677732.

The previous prime is 12208549. The next prime is 12208571. The reversal of 12208561 is 16580221.

12208561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16580221 = 7 ⋅2368603.

It is a cyclic number.

It is not a de Polignac number, because 12208561 - 2⁷ = 12208433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12208531) 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, 265381 + ... + 265426.

It is an arithmetic number, because the mean of its divisors is an integer number (3184848).

Almost surely, 2^12208561 is an apocalyptic number.

It is an amenable number.

12208561 is a deficient number, since it is larger than the sum of its proper divisors (530831).

12208561 is an equidigital number, since it uses as much as digits as its factorization.

12208561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530830.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 12208561 is about 3494.0751279845. The cubic root of 12208561 is about 230.2615864345.

Adding to 12208561 its reverse (16580221), we get a palindrome (28788782).

It can be divided in two parts, 12208 and 561, that added together give a square (12769 = 113²).

The spelling of 12208561 in words is "twelve million, two hundred eight thousand, five hundred sixty-one".