2133

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Number

$2133$ (two thousand, one hundred and thirty-three) is:

$3^3 \times 79$

The $27$th octagonal number, after $1$, $8$, $21$, $40$, $65$, $\ldots$, $645$, $736$, $833$, $936$, $1045$, $1160$, $1281$, $1408$, $1541$, $1680$, $1825$, $1976$:

$2133 = \ds \sum_{k \mathop = 1}^{27} \paren {6 k - 5} = 27 \paren {3 \times 27 - 2}$

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