9801

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Number

$9801$ (nine thousand, eight hundred and one) is:

$3^4 \times 11^2$

The $99$th square number after $1$, $4$, $9$, $16$, $25$, $36$, $\ldots$, $7396$, $7569$, $7744$, $7921$, $8100$, $8281$, $8464$, $8649$, $8836$, $9025$, $9216$, $9409$, $9604$

$9801 = 99 \times 99$

The $2$nd of only $2$ numbers with $4$ digits or fewer which is a multiple of its reversal:

$9801 = 9 \times 1089$

Also see

• Previous  ... Next: Ratio of Number to Reversal which is Multiple
• Previous  ... Next: Square Number

Sources

• 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $9801$
• 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $9801$