12644591 has 2 divisors, whose sum is σ = 12644592. Its totient is φ = 12644590.

The previous prime is 12644579. The next prime is 12644669. The reversal of 12644591 is 19544621.

12644591 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 is a cyclic number.

It is not a de Polignac number, because 12644591 - 2¹⁴ = 12628207 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12644561) 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, 6322295 + 6322296.

It is an arithmetic number, because the mean of its divisors is an integer number (6322296).

Almost surely, 2^12644591 is an apocalyptic number.

12644591 is a deficient number, since it is larger than the sum of its proper divisors (1).

12644591 is an equidigital number, since it uses as much as digits as its factorization.

12644591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 32.

The square root of 12644591 is about 3555.9233681282. The cubic root of 12644591 is about 232.9708560133.

The spelling of 12644591 in words is "twelve million, six hundred forty-four thousand, five hundred ninety-one".