6805991 has 2 divisors, whose sum is σ = 6805992. Its totient is φ = 6805990.

The previous prime is 6805987. The next prime is 6806017. The reversal of 6805991 is 1995086.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6805991 - 2² = 6805987 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6895991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3402995 + 3402996.

It is an arithmetic number, because the mean of its divisors is an integer number (3402996).

Almost surely, 2^6805991 is an apocalyptic number.

6805991 is a deficient number, since it is larger than the sum of its proper divisors (1).

6805991 is an equidigital number, since it uses as much as digits as its factorization.

6805991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 6805991 is about 2608.8294309901. The cubic root of 6805991 is about 189.5092691841.

The spelling of 6805991 in words is "six million, eight hundred five thousand, nine hundred ninety-one".