12643109 has 2 divisors, whose sum is σ = 12643110. Its totient is φ = 12643108.

The previous prime is 12643049. The next prime is 12643117. The reversal of 12643109 is 90134621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12271009 + 372100 = 3503^2 + 610^2 .

It is a cyclic number.

It is not a de Polignac number, because 12643109 - 2⁸ = 12642853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12642109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6321554 + 6321555.

It is an arithmetic number, because the mean of its divisors is an integer number (6321555).

Almost surely, 2^12643109 is an apocalyptic number.

It is an amenable number.

12643109 is a deficient number, since it is larger than the sum of its proper divisors (1).

12643109 is an equidigital number, since it uses as much as digits as its factorization.

12643109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 12643109 is about 3555.7149773288. The cubic root of 12643109 is about 232.9617539316.

The spelling of 12643109 in words is "twelve million, six hundred forty-three thousand, one hundred nine".