555

What would you like to do with 555? Here are quick options and facts. Pick one and I’ll go deeper.

Number theory

• Prime factorization: 555 = 3 × 5 × 37
• Divisors: 1, 3, 5, 15, 37, 111, 185, 555 (8 divisors)
• Sum of divisors σ(555) = 912; sum of proper divisors = 357
• 555 is a deficient number (sum of proper divisors < 555)
• Roman numeral: DLV

Conversions

• Binary: 555 = 1000101011₂
• Hexadecimal: 0x22B
• Octal: 1053₈

Other quick facts

• 555 ends in 5, so divisible by 5: 555 = 5 × 111
• If you’re studying electronics, 555 timer IC basics (monostable/astable) are a common exam topic.

Which topic would you like me to expand on, or do you want a practice problem?