199 (number)

Template:Infobox 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: $$\begin{array}{cc}199& \mapsto 1+9+9=19\\ & \mapsto 1+9=10\\ & \mapsto 1+0=1.\end{array}$$ Thus, its additive persistence is three, and it is the smallest number of persistence three.

See also

• Template:In title

References

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