Unknown number 4

I think number. When I divided its square root by its 1/9, I get a number 1. What number am I thinking?

Result

x =  81

Solution:

x/(x/9)=1 x=9 x=92=81\sqrt{ x }/(x/9)=1 \ \\ \sqrt{ x }=9 \ \\ x=9^2=81

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