555

Could you clarify what you’d like to do with 555? Are you asking for math facts, base conversions, or is this part of a problem you’re solving?

Here are quick, exam-relevant notes you can use right away:

• Prime factorization: 555 = 3 × 5 × 37
• Divisibility: divisible by 3 (sum of digits 15), by 5 (ends with 5), by 15 (both). Not divisible by 9 or 11.
• Roman numeral: 555 = DLV
• Binary: 555 = 1000101011₂
• Hexadecimal: 555 = 0x22B
• One nice factorization: 555 = 15 × 37

Sample practice questions (with quick answers):

1. Show 555 is a Harshad number. Answer: sum of digits = 15, 555/15 = 37, an integer.
2. Convert 555 to base 7. Answer: 1422₇
3. Write 555 as a product of two numbers with decimal digits 5 (i.e., using its factors). Answer: 15 × 37
4. Convert 555 to base 2 and base 16. Answers: 2₂ = 1000101011, 0x22B

If you want, tell me the exact topic (e.g., factoring, modular arithmetic, numeral bases) and I’ll tailor a short set of problems.