12568561 has 2 divisors, whose sum is σ = 12568562. Its totient is φ = 12568560.

The previous prime is 12568553. The next prime is 12568573. The reversal of 12568561 is 16586521.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9960336 + 2608225 = 3156^2 + 1615^2 .

It is a cyclic number.

It is not a de Polignac number, because 12568561 - 2³ = 12568553 is a prime.

It is a super-2 number, since 2×12568561² = 315937451221442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12568531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6284280 + 6284281.

It is an arithmetic number, because the mean of its divisors is an integer number (6284281).

Almost surely, 2^12568561 is an apocalyptic number.

It is an amenable number.

12568561 is a deficient number, since it is larger than the sum of its proper divisors (1).

12568561 is an equidigital number, since it uses as much as digits as its factorization.

12568561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14400, while the sum is 34.

The square root of 12568561 is about 3545.2166365400. The cubic root of 12568561 is about 232.5029775701.

It can be divided in two parts, 125 and 68561, that added together give a palindrome (68686).

The spelling of 12568561 in words is "twelve million, five hundred sixty-eight thousand, five hundred sixty-one".