555

Could you clarify what you’d like about 555? Here are quick facts you might find useful for exams, plus a mini practice set.

Quick facts

• Divisible by: 3, 5, 15
• Not divisible by: 7, 9, 11
• Prime factorization: 3 × 5 × 37
• Divisors: 1, 3, 5, 15, 37, 111, 185, 555
• Roman numeral: DLV
• Binary: 1000101011
• Hex: 0x22B
• In words: five hundred fifty-five

Mini practice

1. Is 555 divisible by 9? Why or why not?
2. What are the two divisors of 555 whose product is 555 and have the smallest difference?
3. Convert 555 to hexadecimal.
4. If you write 555 as a product of two integers with the factors closest to sqrt(555), what are they?

If you tell me your subject and level, I can tailor more practice questions or explanations.