6639159 has 4 divisors (see below), whose sum is σ = 8852216. Its totient is φ = 4426104.

The previous prime is 6639119. The next prime is 6639209. The reversal of 6639159 is 9519366.

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

It is not a de Polignac number, because 6639159 - 2⁸ = 6638903 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6639109) 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 3 ways as a sum of consecutive naturals, for example, 1106524 + ... + 1106529.

It is an arithmetic number, because the mean of its divisors is an integer number (2213054).

Almost surely, 2^6639159 is an apocalyptic number.

6639159 is a deficient number, since it is larger than the sum of its proper divisors (2213057).

6639159 is a wasteful number, since it uses less digits than its factorization.

6639159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2213056.

The product of its digits is 43740, while the sum is 39.

The square root of 6639159 is about 2576.6565545295. The cubic root of 6639159 is about 187.9479918761.

The spelling of 6639159 in words is "six million, six hundred thirty-nine thousand, one hundred fifty-nine".