9 has three factors: 1, 3, and 9.
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The number 9: factors are 9, 3, and 1.
The largest one digit number that has three factors is 9. Its factors are 1, 3, and 9.
Well, honey, an odd number with only 3 factors is like finding a unicorn at the grocery store - rare but not impossible. The number you're looking for is 9. It's odd, and its factors are 1, 3, and 9. Voilà!
512 has 9 prime factors