1 000 000 000 (One billion, U.S. and scientific. One thousand million, Britian. One milliard, other countries.)
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999999999 is not a prime number because it has more factors than 1 and itself. It is obvious that 9 is one of its additional factors.
999999999
999999999
With no digit rejected, 999999999 With no digit repeated, 987654321
999999999 times 999993 is 999,992,999,000,007