6644491 has 4 divisors (see below), whose sum is σ = 7593712. Its totient is φ = 5695272.

The previous prime is 6644483. The next prime is 6644503. The reversal of 6644491 is 1944466.

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 6644491 - 2³ = 6644483 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6644431) 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 in 3 ways as a sum of consecutive naturals, for example, 474600 + ... + 474613.

It is an arithmetic number, because the mean of its divisors is an integer number (1898428).

Almost surely, 2^6644491 is an apocalyptic number.

6644491 is a deficient number, since it is larger than the sum of its proper divisors (949221).

6644491 is an equidigital number, since it uses as much as digits as its factorization.

6644491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 949220.

The product of its digits is 20736, while the sum is 34.

The square root of 6644491 is about 2577.6910210497. The cubic root of 6644491 is about 187.9982929527.

The spelling of 6644491 in words is "six million, six hundred forty-four thousand, four hundred ninety-one".