555

Not sure what you want about 555. Here are a few quick angles—tell me which you’d like and I’ll dive deeper.

• Math facts

  • Prime factorization: 555 = 3 × 5 × 37
  • Divisors: {1, 3, 5, 15, 37, 111, 185, 555}
  • Divisible by 3 and 5 (sum of digits is 15; ends in 5)

• Representations

  • Roman numeral: DLV
  • Binary: 555₂ = 1000101011₂
  • Base-6: 555₁₀ = 2323₆

• If you meant the 555 timer IC (electronics)

  • It’s a versatile timer/oscillator used to generate delays, pulses, and PWM signals.

Would you like a quick practice problem in one of these areas, or a deeper explanation of a specific representation?