6803991 has 12 divisors (see below), whose sum is σ = 10068240. Its totient is φ = 4425120.

The previous prime is 6803987. The next prime is 6804011. The reversal of 6803991 is 1993086.

It is not a de Polignac number, because 6803991 - 2² = 6803987 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6803941) 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 11 ways as a sum of consecutive naturals, for example, 8851 + ... + 9588.

It is an arithmetic number, because the mean of its divisors is an integer number (839020).

Almost surely, 2^6803991 is an apocalyptic number.

6803991 is a deficient number, since it is larger than the sum of its proper divisors (3264249).

6803991 is a wasteful number, since it uses less digits than its factorization.

6803991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18486 (or 18483 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 6803991 is about 2608.4460891496. The cubic root of 6803991 is about 189.4907043799.

The spelling of 6803991 in words is "six million, eight hundred three thousand, nine hundred ninety-one".