199 (number)
199 (one hundred [and] ninety-nine) is the natural number following 198 and preceding 200. In mathematics. 199 is a centered triangular number. 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: formula_1 Thus, its additive persistence is three, and it is the smallest number of persistence three.