555

Do you want a quick fact, or help with a problem using 555? Here are some useful quick facts you can use in exams:

• Prime factorization: 555 = 3 × 5 × 37
• Divisibility: divisible by 3 (sum of digits 5+5+5 = 15), divisible by 5 (ends in 5), hence divisible by 15; 555/15 = 37 (and 37 is prime)
• Roman numeral: 555 = DLV
• Binary: 555 = 1000101011₂
• Base-9: 555₁₀ = 455₉
• If written as 555 in base 10, it’s 15 × 37

Would you like me to turn this into a quick practice problem, or convert 555 to another base, or prove the factorization?