Find the number for September

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Puzzle. This is a tough one. Let us see who can do it.
Here is a list showing the month and a number for each
January 7110
February 826
March 5313
April 541
May 3513
June 4610
July 4710
August 681
Decipher the logic and find the number for September = ?
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9919
9 - 9 Letters of the Month
9 - 9th Month
19 - S is the 19th Letter of alphabets