6644191 has 2 divisors, whose sum is σ = 6644192. Its totient is φ = 6644190.

The previous prime is 6644177. The next prime is 6644227. The reversal of 6644191 is 1914466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6644191 - 2⁵ = 6644159 is a prime.

It is a Chen prime.

6644191 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6644101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3322095 + 3322096.

It is an arithmetic number, because the mean of its divisors is an integer number (3322096).

Almost surely, 2^6644191 is an apocalyptic number.

6644191 is a deficient number, since it is larger than the sum of its proper divisors (1).

6644191 is an equidigital number, since it uses as much as digits as its factorization.

6644191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 31.

The square root of 6644191 is about 2577.6328287791. The cubic root of 6644191 is about 187.9954635242.

The spelling of 6644191 in words is "six million, six hundred forty-four thousand, one hundred ninety-one".