The 999th digit of π after the decimal point is 3, and the 1001st digit is 5. These digits are part of the infinite non-repeating decimal expansion of π, which begins as 3.14159... and continues indefinitely.
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The 999th digit, averall, is 9. The 999th digit after the decimal place is 8.
The 1000th is 7919, so the 1001st is 7927.
A quadrillion has 16 digits.
There is no such thing as scientific digits. There are 6 digits in the number of which 3 are SIGNIFICANT (not scientific) digits.
There are three significant digits. I am not sure what scientific digits are!