6639125 has 8 divisors (see below), whose sum is σ = 8285784. Its totient is φ = 5311200.

The previous prime is 6639119. The next prime is 6639209. The reversal of 6639125 is 5219366.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 293764 + 6345361 = 542^2 + 2519^2 .

It is not a de Polignac number, because 6639125 - 2⁴ = 6639109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6639091 and 6639100.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 26432 + ... + 26681.

It is an arithmetic number, because the mean of its divisors is an integer number (1035723).

Almost surely, 2^6639125 is an apocalyptic number.

It is an amenable number.

6639125 is a deficient number, since it is larger than the sum of its proper divisors (1646659).

6639125 is an equidigital number, since it uses as much as digits as its factorization.

6639125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53128 (or 53118 counting only the distinct ones).

The product of its digits is 9720, while the sum is 32.

The square root of 6639125 is about 2576.6499568238. The cubic root of 6639125 is about 187.9476710402.

The spelling of 6639125 in words is "six million, six hundred thirty-nine thousand, one hundred twenty-five".