6639911 has 16 divisors (see below), whose sum is σ = 7544160. Its totient is φ = 5806080.

The previous prime is 6639907. The next prime is 6639929. The reversal of 6639911 is 1199366.

It is a cyclic number.

It is not a de Polignac number, because 6639911 - 2² = 6639907 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6639011) 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 15 ways as a sum of consecutive naturals, for example, 19535 + ... + 19871.

It is an arithmetic number, because the mean of its divisors is an integer number (471510).

Almost surely, 2^6639911 is an apocalyptic number.

6639911 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

6639911 is a deficient number, since it is larger than the sum of its proper divisors (904249).

6639911 is a wasteful number, since it uses less digits than its factorization.

6639911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434.

The product of its digits is 8748, while the sum is 35.

The square root of 6639911 is about 2576.8024759380. The cubic root of 6639911 is about 187.9550877324.

The spelling of 6639911 in words is "six million, six hundred thirty-nine thousand, nine hundred eleven".