12644903 has 2 divisors, whose sum is σ = 12644904. Its totient is φ = 12644902.

The previous prime is 12644893. The next prime is 12644909. The reversal of 12644903 is 30944621.

It is a strong prime.

It is an emirp because it is prime and its reverse (30944621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12644903 - 2¹⁰ = 12643879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12644909) 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, 6322451 + 6322452.

It is an arithmetic number, because the mean of its divisors is an integer number (6322452).

Almost surely, 2^12644903 is an apocalyptic number.

12644903 is a deficient number, since it is larger than the sum of its proper divisors (1).

12644903 is an equidigital number, since it uses as much as digits as its factorization.

12644903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 12644903 is about 3555.9672383193. The cubic root of 12644903 is about 232.9727721504.

The spelling of 12644903 in words is "twelve million, six hundred forty-four thousand, nine hundred three".