6811639 has 2 divisors, whose sum is σ = 6811640. Its totient is φ = 6811638.

The previous prime is 6811627. The next prime is 6811667. The reversal of 6811639 is 9361186.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6811639 - 2⁹ = 6811127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6811619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3405819 + 3405820.

It is an arithmetic number, because the mean of its divisors is an integer number (3405820).

Almost surely, 2^6811639 is an apocalyptic number.

6811639 is a deficient number, since it is larger than the sum of its proper divisors (1).

6811639 is an equidigital number, since it uses as much as digits as its factorization.

6811639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 34.

The square root of 6811639 is about 2609.9116843296. The cubic root of 6811639 is about 189.5616765612.

The spelling of 6811639 in words is "six million, eight hundred eleven thousand, six hundred thirty-nine".