12644913 has 4 divisors (see below), whose sum is σ = 16859888. Its totient is φ = 8429940.

The previous prime is 12644909. The next prime is 12644921. The reversal of 12644913 is 31944621.

12644913 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31944621 = 3 ⋅10648207.

It is not a de Polignac number, because 12644913 - 2² = 12644909 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12644903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2107483 + ... + 2107488.

It is an arithmetic number, because the mean of its divisors is an integer number (4214972).

Almost surely, 2^12644913 is an apocalyptic number.

It is an amenable number.

12644913 is a deficient number, since it is larger than the sum of its proper divisors (4214975).

12644913 is an equidigital number, since it uses as much as digits as its factorization.

12644913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4214974.

The product of its digits is 5184, while the sum is 30.

The square root of 12644913 is about 3555.9686444062. The cubic root of 12644913 is about 232.9728335645.

The spelling of 12644913 in words is "twelve million, six hundred forty-four thousand, nine hundred thirteen".