6681889 has 2 divisors, whose sum is σ = 6681890. Its totient is φ = 6681888.

The previous prime is 6681887. The next prime is 6681923. The reversal of 6681889 is 9881866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6671889 + 10000 = 2583^2 + 100^2 .

It is a cyclic number.

It is not a de Polignac number, because 6681889 - 2¹ = 6681887 is a prime.

Together with 6681887, it forms a pair of twin primes.

6681889 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (6681887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3340944 + 3340945.

It is an arithmetic number, because the mean of its divisors is an integer number (3340945).

Almost surely, 2^6681889 is an apocalyptic number.

It is an amenable number.

6681889 is a deficient number, since it is larger than the sum of its proper divisors (1).

6681889 is an equidigital number, since it uses as much as digits as its factorization.

6681889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 46.

The square root of 6681889 is about 2584.9350088542. The cubic root of 6681889 is about 188.3503445272.

The spelling of 6681889 in words is "six million, six hundred eighty-one thousand, eight hundred eighty-nine".