555

Could you clarify what you want about "555"? It could mean several things. Here are a few quick possibilities and a small fact for each. Pick one and I’ll go deeper with worked examples and practice problems.

• Math number 555

  • Factorization: 555 = 3 × 5 × 37
  • Divisors: 1, 3, 5, 15, 37, 111, 185, 555 (8 divisors)
  • Roman numeral: DLV
  • Binary: 1000101011

• 555 timer IC (electronics)

  • Used in astable and monostable configurations
  • Astable frequency: f ≈ 1.44 / ((R1 + 2R2) C)
  • Duty cycle: D ≈ (R1 + R2) / (R1 + 2R2)
  • Monostable pulse width: T ≈ 1.1 R C

• Other representations

  • Decimal to hex: 555 = 0x22B
  • Decimal to Octal: 555 = 0o1063

Which do you want to focus on, or do you have a specific exam problem involving 555?