6444689 has 2 divisors, whose sum is σ = 6444690. Its totient is φ = 6444688.

The previous prime is 6444679. The next prime is 6444703. The reversal of 6444689 is 9864446.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5856400 + 588289 = 2420^2 + 767^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6444689 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6444619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3222344 + 3222345.

It is an arithmetic number, because the mean of its divisors is an integer number (3222345).

Almost surely, 2^6444689 is an apocalyptic number.

It is an amenable number.

6444689 is a deficient number, since it is larger than the sum of its proper divisors (1).

6444689 is an equidigital number, since it uses as much as digits as its factorization.

6444689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 41.

The square root of 6444689 is about 2538.6392024075. The cubic root of 6444689 is about 186.0946929866.

The spelling of 6444689 in words is "six million, four hundred forty-four thousand, six hundred eighty-nine".