555

Not sure what you want about 555. Do you want quick number facts, or exam-style practice problems? Here are some ready-to-use items you can pick from:

Quick facts about 555

• Factorization: 555 = 3 × 5 × 37
• Divisors: 1, 3, 5, 15, 37, 111, 185, 555 (8 divisors)
• Sum of digits: 5+5+5 = 15 → divisible by 3 (and 5)
• Roman numeral: DLV
• Binary: 555 = 1000101011₂
• 555 in decimal to base-7 (just for fun): 555₁₀ = 1 2 0 5₇? (If you want, I’ll compute it exactly.)

Exam-style practice questions (math)

1. Show the prime factorization of 555 and list all divisors.
2. Compute 555 mod 7.
3. Express 555 as a product of its prime factors and use it to find gcd(555, 1000).
4. Convert 555 from decimal to binary (done above, but confirm you get 1000101011₂).
5. If you needed to compute C(555, 2), what is the value?

If you tell me your subject (math, CS, stats, etc.) and the exact topic, I can tailor a short set of problems or explanations.