6639211 has 8 divisors (see below), whose sum is σ = 6811200. Its totient is φ = 6469320.

The previous prime is 6639209. The next prime is 6639223. The reversal of 6639211 is 1129366.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6639211 - 2¹ = 6639209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6639211.

It is not an unprimeable number, because it can be changed into a prime (6639251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7300 + ... + 8158.

It is an arithmetic number, because the mean of its divisors is an integer number (851400).

Almost surely, 2^6639211 is an apocalyptic number.

6639211 is a deficient number, since it is larger than the sum of its proper divisors (171989).

6639211 is a wasteful number, since it uses less digits than its factorization.

6639211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1049.

The product of its digits is 1944, while the sum is 28.

The square root of 6639211 is about 2576.6666451056. Note that the first 4 decimals coincide. The cubic root of 6639211 is about 187.9484825643.

The spelling of 6639211 in words is "six million, six hundred thirty-nine thousand, two hundred eleven".