6789991 has 8 divisors (see below), whose sum is σ = 7630560. Its totient is φ = 5994912.

The previous prime is 6789983. The next prime is 6790009. The reversal of 6789991 is 1999876.

6789991 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6789991 - 2³ = 6789983 is a prime.

It is a super-2 number, since 2×6789991² = 92207955560162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6789901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11056 + ... + 11653.

It is an arithmetic number, because the mean of its divisors is an integer number (953820).

Almost surely, 2^6789991 is an apocalyptic number.

6789991 is a deficient number, since it is larger than the sum of its proper divisors (840569).

6789991 is a wasteful number, since it uses less digits than its factorization.

6789991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22745.

The product of its digits is 244944, while the sum is 49.

The square root of 6789991 is about 2605.7611172170. The cubic root of 6789991 is about 189.3606487761.

The spelling of 6789991 in words is "six million, seven hundred eighty-nine thousand, nine hundred ninety-one".