555

Here are quick facts and options for 555. Tell me which you want or I can tailor to your exam:

• Factorization: 555 = 3 × 5 × 37
• Divisibility: divisible by 3 and 5 (since digit sum 15; 555/15 = 37)
• Harshad number (base 10)
• Roman numeral: DLV
• Binary/Hex: 555 = 1000101011₂ = 0x22B

Practice ideas:

1. List all factor pairs: 1×555, 3×185, 5×111, 15×37.
2. Convert to binary and hex (answers above).
3. Check primality: explain why 555 is not prime.

Want more problems or a different angle (e.g., modulo arithmetic, sequences)?