6990889 has 2 divisors, whose sum is σ = 6990890. Its totient is φ = 6990888.

The previous prime is 6990881. The next prime is 6990901. The reversal of 6990889 is 9880996.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6801664 + 189225 = 2608^2 + 435^2 .

It is a cyclic number.

It is not a de Polignac number, because 6990889 - 2³ = 6990881 is a prime.

6990889 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (6990881) 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, 3495444 + 3495445.

It is an arithmetic number, because the mean of its divisors is an integer number (3495445).

Almost surely, 2^6990889 is an apocalyptic number.

It is an amenable number.

6990889 is a deficient number, since it is larger than the sum of its proper divisors (1).

6990889 is an equidigital number, since it uses as much as digits as its factorization.

6990889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 49.

The square root of 6990889 is about 2644.0289332759. The cubic root of 6990889 is about 191.2100883579.

The spelling of 6990889 in words is "six million, nine hundred ninety thousand, eight hundred eighty-nine".