6889559891 has 2 divisors, whose sum is σ = 6889559892. Its totient is φ = 6889559890.

The previous prime is 6889559869. The next prime is 6889559921. The reversal of 6889559891 is 1989559886.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6889559891 - 2⁶ = 6889559827 is a prime.

It is not a weakly prime, because it can be changed into another prime (6889559851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3444779945 + 3444779946.

It is an arithmetic number, because the mean of its divisors is an integer number (3444779946).

Almost surely, 2^6889559891 is an apocalyptic number.

6889559891 is a deficient number, since it is larger than the sum of its proper divisors (1).

6889559891 is an equidigital number, since it uses as much as digits as its factorization.

6889559891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55987200, while the sum is 68.

The square root of 6889559891 is about 83003.3727688219. The cubic root of 6889559891 is about 1902.8176008354.

The spelling of 6889559891 in words is "six billion, eight hundred eighty-nine million, five hundred fifty-nine thousand, eight hundred ninety-one".