what is the divisibility test of the number 9

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$$\begin{gathered} \mathrm{If} \mathrm{a} \mathrm{number} \mathrm{is} \mathrm{divisible} \mathrm{by} 9, \mathrm{then} \mathrm{sum} \mathrm{of} \mathrm{digits} \mathrm{must} \mathrm{be} \mathrm{divisible} \mathrm{by} 9. \\ \mathrm{e}.\mathrm{g}. 243 \mathrm{is} \mathrm{divisible} \mathrm{by} 9 \mathrm{as} 2+4+3=9 \mathrm{is} \mathrm{divisible} \mathrm{by} 9. \end{gathered}$$
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