6823991 has 2 divisors, whose sum is σ = 6823992. Its totient is φ = 6823990.

The previous prime is 6823963. The next prime is 6824003. The reversal of 6823991 is 1993286.

6823991 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6823991 - 2¹⁴ = 6807607 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 (6823931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3411995 + 3411996.

It is an arithmetic number, because the mean of its divisors is an integer number (3411996).

Almost surely, 2^6823991 is an apocalyptic number.

6823991 is a deficient number, since it is larger than the sum of its proper divisors (1).

6823991 is an equidigital number, since it uses as much as digits as its factorization.

6823991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 38.

The square root of 6823991 is about 2612.2769761264. The cubic root of 6823991 is about 189.6761889882.

The spelling of 6823991 in words is "six million, eight hundred twenty-three thousand, nine hundred ninety-one".