6933991 has 2 divisors, whose sum is σ = 6933992. Its totient is φ = 6933990.

The previous prime is 6933967. The next prime is 6934003. The reversal of 6933991 is 1993396.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6933991 - 2⁵ = 6933959 is a prime.

6933991 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6933791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3466995 + 3466996.

It is an arithmetic number, because the mean of its divisors is an integer number (3466996).

Almost surely, 2^6933991 is an apocalyptic number.

6933991 is a deficient number, since it is larger than the sum of its proper divisors (1).

6933991 is an equidigital number, since it uses as much as digits as its factorization.

6933991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39366, while the sum is 40.

The square root of 6933991 is about 2633.2472348794. The cubic root of 6933991 is about 190.6899293643.

The spelling of 6933991 in words is "six million, nine hundred thirty-three thousand, nine hundred ninety-one".