6639099 has 4 divisors (see below), whose sum is σ = 8852136. Its totient is φ = 4426064.

The previous prime is 6639077. The next prime is 6639107. The reversal of 6639099 is 9909366.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6639099 - 2⁵ = 6639067 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 6639099.

It is not an unprimeable number, because it can be changed into a prime (6639049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1106514 + ... + 1106519.

It is an arithmetic number, because the mean of its divisors is an integer number (2213034).

Almost surely, 2^6639099 is an apocalyptic number.

6639099 is a deficient number, since it is larger than the sum of its proper divisors (2213037).

6639099 is a wasteful number, since it uses less digits than its factorization.

6639099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2213036.

The product of its (nonzero) digits is 78732, while the sum is 42.

The square root of 6639099 is about 2576.6449115080. The cubic root of 6639099 is about 187.9474256943.

The spelling of 6639099 in words is "six million, six hundred thirty-nine thousand, ninety-nine".