9455

Number
$9455$ (nine thousand, four hundred and fifty-five) is:


 * $5 \times 31 \times 61$


 * The $30$th square pyramidal number after $1$, $5$, $14$, $30$, $55$, $\ldots$, $3311$, $3795$, $4324$, $4900$, $5525$, $6201$, $6930$, $7714$, $8555$:
 * $9455 = \displaystyle \sum_{k \mathop = 1}^{30} k^2 = \dfrac {30 \left({30 + 1}\right) \left({2 \times 30 + 1}\right)} 6$