555

Not sure what you want with 555. Do you want a quick fact, a conversion, or a small problem? Here are a few quick options:

• Roman numerals: 555 = DLV
• Prime factorization: 555 = 3 × 5 × 37
  • Number of divisors: 8 (1, 3, 5, 15, 37, 111, 185, 555)
• Binary: 555 decimal = 1000101011₂
• Base 7: 555 decimal = 1422₇
• In words: five hundred fifty-five
• Quick exam-style prompts you could use:
  • Prove the factorization 555 = 3 × 5 × 37
  • Show that 555 is a Harshad number (sum of digits is 15, divisible by 3 and 5)

If you tell me your course or what you’re practicing (e.g., number theory, conversions, programming), I can tailor a short practice set.