199216889 has 2 divisors, whose sum is σ = 199216890. Its totient is φ = 199216888.

The previous prime is 199216837. The next prime is 199216903. The reversal of 199216889 is 988612991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130873600 + 68343289 = 11440^2 + 8267^2 .

It is an emirp because it is prime and its reverse (988612991) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199216889 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 199216889.

It is not a weakly prime, because it can be changed into another prime (199212889) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99608444 + 99608445.

It is an arithmetic number, because the mean of its divisors is an integer number (99608445).

Almost surely, 2^199216889 is an apocalyptic number.

It is an amenable number.

199216889 is a deficient number, since it is larger than the sum of its proper divisors (1).

199216889 is an equidigital number, since it uses as much as digits as its factorization.

199216889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 559872, while the sum is 53.

The square root of 199216889 is about 14114.4213129692. The cubic root of 199216889 is about 584.0392724340.

It can be divided in two parts, 1992 and 16889, that added together give a palindrome (18881).

The spelling of 199216889 in words is "one hundred ninety-nine million, two hundred sixteen thousand, eight hundred eighty-nine".