12418561 has 2 divisors, whose sum is σ = 12418562. Its totient is φ = 12418560.

The previous prime is 12418547. The next prime is 12418579. The reversal of 12418561 is 16581421.

12418561 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8880400 + 3538161 = 2980^2 + 1881^2 .

It is a cyclic number.

It is not a de Polignac number, because 12418561 - 2⁷ = 12418433 is a prime.

It is not a weakly prime, because it can be changed into another prime (12418501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6209280 + 6209281.

It is an arithmetic number, because the mean of its divisors is an integer number (6209281).

Almost surely, 2^12418561 is an apocalyptic number.

It is an amenable number.

12418561 is a deficient number, since it is larger than the sum of its proper divisors (1).

12418561 is an equidigital number, since it uses as much as digits as its factorization.

12418561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1920, while the sum is 28.

The square root of 12418561 is about 3523.9978717360. The cubic root of 12418561 is about 231.5743346723.

Adding to 12418561 its reverse (16581421), we get a palindrome (28999982).

The spelling of 12418561 in words is "twelve million, four hundred eighteen thousand, five hundred sixty-one".