555

What would you like to do with 555? Here are quick facts you can use for exam-style problems:

• Prime factorization: 555 = 3 × 5 × 37
• Divisibility: divisible by 3 and 5; 555 = 15 × 37
• Number of divisors: (exponents are 1,1,1) → (1+1)(1+1)(1+1) = 8 divisors
• Harshad (Niven) number: 555 ÷ (5+5+5 = 15) = 37
• Roman numeral: DLV
• Binary: 555 = 1000101011₂
• Hexadecimal: 0x22B

Possible practice prompts:

• Find the prime factorization and list all divisors.
• Show that 555 is a Harshad number.
• Convert 555 to base 2 and base 16.
• Solve a modular arithmetic problem using 555, e.g., 7n ≡ 555 (mod m).

Tell me which direction you want (factorization, base conversions, problems, etc.), or share the exact problem you’re studying.