12644491 has 4 divisors (see below), whose sum is σ = 12986272. Its totient is φ = 12302712.

The previous prime is 12644483. The next prime is 12644561. The reversal of 12644491 is 19444621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12644491 - 2³ = 12644483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12644591) 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, 170835 + ... + 170908.

It is an arithmetic number, because the mean of its divisors is an integer number (3246568).

Almost surely, 2^12644491 is an apocalyptic number.

12644491 is a deficient number, since it is larger than the sum of its proper divisors (341781).

12644491 is an equidigital number, since it uses as much as digits as its factorization.

12644491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341780.

The product of its digits is 6912, while the sum is 31.

The square root of 12644491 is about 3555.9093070549. The cubic root of 12644491 is about 232.9702418601.

The spelling of 12644491 in words is "twelve million, six hundred forty-four thousand, four hundred ninety-one".