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:
<math display=block>
\begin{align}
199&\mapsto 1+9+9=19\\
&\mapsto 1+9=10\\
&\mapsto 1+0=1.
\end{align}</math>
Thus, its additive persistence is three, and it is the smallest number of persistence three.