I have a question about Ksp and Beta-1 of AgCl

I'm sorry I don't install the Sougou program on my computer. The question has been described below.
As we know, the value of Ksp and Beta-1 of AgCl is 1.0E-10 and 1.1E3, respectively. Why the value of 1/Ksp and Beta-1 of AgCl are not equal?
Ksp = [Ag+]*[Cl-] = 1.0E-10,
while Beta-1 = 1/([Ag+]*[Cl-]) = 1.1E3
Thanks for your help!