If you mean Roman numeral then it is M = 1000
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It is 1000.
After 1001 comes 1002. In the decimal number system, each number is followed by the next consecutive number, which increases by 1. So, after 1001, the next number in the sequence is 1002.
If you mean in Roman numerals then 1001 = MI
MI
MI means: 1000+1 = 1001