← 198 199 200 →
Cardinalone hundred ninety-nine
Ordinal199th
(one hundred ninety-ninth)
Factorizationprime
Prime46th
Greek numeralΡϞΘ´
Roman numeralCXCIX
Binary110001112
Ternary211013
Senary5316
Octal3078
Duodecimal14712

199 (one hundred [and] ninety-nine) is the natural number following 198 and preceding 200.

## In mathematics

199 is a centered triangular number.[1]

It is a prime number and the fourth part of a prime quadruplet: 191, 193, 197, 199.[2]

199 is the smallest natural number that takes more than two iterations to compute its digital root as a repeated digit sum:

{\displaystyle {\begin{aligned}199&\mapsto 1+9+9=19\\&\mapsto 1+9=10\\&\mapsto 1+0=1.\end{aligned))}
Thus, its additive persistence is three, and it is the smallest number of persistence three.[3]