555

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

• Math (number properties)

  • Prime factorization: 555 = 3 × 5 × 37
  • Divisors: 1, 3, 5, 15, 37, 111, 185, 555
  • In words: five hundred fifty-five
  • In Roman numerals: DLV
  • In base-10 digits: repdigit (all digits are 5)

• Base conversions

  • Binary: 1000101011
  • Hex: 0x22B
  • Octal: 0o1053

• Electronics (555 timer IC)

  • Common uses: astable and monostable configurations
  • 8-pin DIP: Pin 1 GND, 2 Trigger, 3 Output, 4 Reset, 5 Control Voltage, 6 Threshold, 7 Discharge, 8 VCC

• General quick facts

  • 555 is divisible by 3 and 5 (since digits sum to 15). Not divisible by 9.

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