199966889 has 2 divisors, whose sum is σ = 199966890. Its totient is φ = 199966888.

The previous prime is 199966873. The next prime is 199966901. The reversal of 199966889 is 988669991.

199966889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199035664 + 931225 = 14108^2 + 965^2 .

It is an emirp because it is prime and its reverse (988669991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199966889 - 2⁴ = 199966873 is a prime.

It is not a weakly prime, because it can be changed into another prime (199966859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99983444 + 99983445.

It is an arithmetic number, because the mean of its divisors is an integer number (99983445).

Almost surely, 2^199966889 is an apocalyptic number.

It is an amenable number.

199966889 is a deficient number, since it is larger than the sum of its proper divisors (1).

199966889 is an equidigital number, since it uses as much as digits as its factorization.

199966889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15116544, while the sum is 65.

The square root of 199966889 is about 14140.9649246436. The cubic root of 199966889 is about 584.7712734777.

The spelling of 199966889 in words is "one hundred ninety-nine million, nine hundred sixty-six thousand, eight hundred eighty-nine".