12643549 has 2 divisors, whose sum is σ = 12643550. Its totient is φ = 12643548.

The previous prime is 12643541. The next prime is 12643571. The reversal of 12643549 is 94534621.

It is a happy number.

12643549 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., 9060100 + 3583449 = 3010^2 + 1893^2 .

It is a cyclic number.

It is not a de Polignac number, because 12643549 - 2³ = 12643541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12643541) 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, 6321774 + 6321775.

It is an arithmetic number, because the mean of its divisors is an integer number (6321775).

Almost surely, 2^12643549 is an apocalyptic number.

It is an amenable number.

12643549 is a deficient number, since it is larger than the sum of its proper divisors (1).

12643549 is an equidigital number, since it uses as much as digits as its factorization.

12643549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 34.

The square root of 12643549 is about 3555.7768490163. The cubic root of 12643549 is about 232.9644563783.

The spelling of 12643549 in words is "twelve million, six hundred forty-three thousand, five hundred forty-nine".