6639331 has 2 divisors, whose sum is σ = 6639332. Its totient is φ = 6639330.

The previous prime is 6639313. The next prime is 6639337. The reversal of 6639331 is 1339366.

Together with previous prime (6639313) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6639331 - 2¹¹ = 6637283 is a prime.

It is a super-2 number, since 2×6639331² = 88161432255122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6639293 and 6639302.

It is not a weakly prime, because it can be changed into another prime (6639337) 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 as a sum of consecutive naturals, namely, 3319665 + 3319666.

It is an arithmetic number, because the mean of its divisors is an integer number (3319666).

Almost surely, 2^6639331 is an apocalyptic number.

6639331 is a deficient number, since it is larger than the sum of its proper divisors (1).

6639331 is an equidigital number, since it uses as much as digits as its factorization.

6639331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8748, while the sum is 31.

The square root of 6639331 is about 2576.6899308997. The cubic root of 6639331 is about 187.9496149118.

The spelling of 6639331 in words is "six million, six hundred thirty-nine thousand, three hundred thirty-one".