The number after 999 million is 1 billion. In the international numbering system, one billion is equal to 1,000 million. So, after 999 million, the next number is 1 billion.
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If you mean what is the next integer or whole number after 999 million then it is: 999,000,001
A big number
The answer is 999.
999
999 is a composite number. This is because composite numbers are any number that has more than two factors (one and itself). Therefore, since there are many factors of 999 besides one and itself such as 3, 9, and 27, that makes it a composite number.
9, 010, 000 comes one after 9, 009, 999.