9916889 has 2 divisors, whose sum is σ = 9916890. Its totient is φ = 9916888.

The previous prime is 9916873. The next prime is 9916891. The reversal of 9916889 is 9886199.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6801664 + 3115225 = 2608^2 + 1765^2 .

It is an emirp because it is prime and its reverse (9886199) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9916889 - 2⁴ = 9916873 is a prime.

Together with 9916891, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9916849) 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, 4958444 + 4958445.

It is an arithmetic number, because the mean of its divisors is an integer number (4958445).

Almost surely, 2^9916889 is an apocalyptic number.

It is an amenable number.

9916889 is a deficient number, since it is larger than the sum of its proper divisors (1).

9916889 is an equidigital number, since it uses as much as digits as its factorization.

9916889 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 9916889 is about 3149.1092391341. The cubic root of 9916889 is about 214.8449504070.

The spelling of 9916889 in words is "nine million, nine hundred sixteen thousand, eight hundred eighty-nine".