6639111 has 16 divisors (see below), whose sum is σ = 10264320. Its totient is φ = 4233240.

The previous prime is 6639109. The next prime is 6639119. The reversal of 6639111 is 1119366.

It is not a de Polignac number, because 6639111 - 2¹ = 6639109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6639119) 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, 4725 + ... + 5966.

It is an arithmetic number, because the mean of its divisors is an integer number (641520).

Almost surely, 2^6639111 is an apocalyptic number.

6639111 is a deficient number, since it is larger than the sum of its proper divisors (3625209).

6639111 is a wasteful number, since it uses less digits than its factorization.

6639111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10723 (or 10717 counting only the distinct ones).

The product of its digits is 972, while the sum is 27.

The square root of 6639111 is about 2576.6472401165. The cubic root of 6639111 is about 187.9475389309.

The spelling of 6639111 in words is "six million, six hundred thirty-nine thousand, one hundred eleven".