199 (one hundred [and] ninety-nine) is the natural number following 198 and preceding 200.
In mathematics It is a prime number and the fourth part of a prime quadruplet: 191, 193, 197, 199.
199 is the smallest natural number that takes more than two iterations to compute its digital root as a repeated digit sum:
Thus, its additive persistence is three, and it is the smallest number of persistence three.
If the digits are rearranged, it will still be prime. 199, 919, 991.
See also
References