When rounding, we take the number to the right of the given place, and round it up or down. Since the number to the right of the hundred thousands place is 7, we would round 9,070,281 up to 9,100,000, or 9.1 million.
Extra tip: If the given number was something like 9,020,281, we'd round down to 9,000,000. Remember that you just need to take the number directly to the right of the given rounding place, and think of a rhyme like "5 or more, give it a score; 4 or less, give it a rest" to help you remember which way to round. :)