6894991 has 2 divisors, whose sum is σ = 6894992. Its totient is φ = 6894990.

The previous prime is 6894983. The next prime is 6894997. The reversal of 6894991 is 1994986.

6894991 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 6894991 - 2³ = 6894983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6894997) 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 as a sum of consecutive naturals, namely, 3447495 + 3447496.

It is an arithmetic number, because the mean of its divisors is an integer number (3447496).

Almost surely, 2^6894991 is an apocalyptic number.

6894991 is a deficient number, since it is larger than the sum of its proper divisors (1).

6894991 is an equidigital number, since it uses as much as digits as its factorization.

6894991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 46.

The square root of 6894991 is about 2625.8314873579. The cubic root of 6894991 is about 190.3317472892.

It can be divided in two parts, 68 and 94991, that added together give a palindrome (95059).

The spelling of 6894991 in words is "six million, eight hundred ninety-four thousand, nine hundred ninety-one".