6881999 has 2 divisors, whose sum is σ = 6882000. Its totient is φ = 6881998.

The previous prime is 6881993. The next prime is 6882011. The reversal of 6881999 is 9991886.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6881999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6881993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3440999 + 3441000.

It is an arithmetic number, because the mean of its divisors is an integer number (3441000).

Almost surely, 2^6881999 is an apocalyptic number.

6881999 is a deficient number, since it is larger than the sum of its proper divisors (1).

6881999 is an equidigital number, since it uses as much as digits as its factorization.

6881999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 50.

The square root of 6881999 is about 2623.3564378483. The cubic root of 6881999 is about 190.2121268855.

The spelling of 6881999 in words is "six million, eight hundred eighty-one thousand, nine hundred ninety-nine".