555

Do you want math problems involving the number 555, or did you mean something else (e.g., Thai slang "555" for laughter)? If you’re after quick math, here are some useful facts and ready-to-use problems.

Quick facts about 555:

• Prime factorization: 555 = 3 × 5 × 37
• Number of divisors: 8
• Sum of all divisors: 912
• Sum of proper divisors: 912 − 555 = 357
• Roman numeral: DLV
• Digit sum: 5 + 5 + 5 = 15 (divisible by 3 and 5)
• Binary: 555 = 1000101011₂
• 555 mod 7 = 2 (since 555 ≡ 2 mod 7)
• 555 mod 9 = 6 (since digit sum is 15, and 15 ≡ 6 mod 9)

Sample exam-style problems (easy to medium):

1. Find the prime factorization of 555 and list all positive divisors.
2. Compute the sum of all divisors of 555.
3. What is 555 written in binary?
4. What is the remainder when 555^2 is divided by 7?
5. Determine 555 modulo 9.

If you want, I can tailor a short practice set at your target level (high school, early university, etc.) or convert these into step-by-step solutions.