555

Not sure what you want about 555. Here are a few quick math notes in case that’s useful for exam prep. If you meant something else, tell me and I’ll tailor it.

• Decimal factorization: 555 = 3 × 5 × 37
• Divisibility: divisible by 3, 5, 15, 37, 111, 185
• Roman numeral: DL V → DLV
• Binary: 555 = 1000101011₂
• Hexadecimal: 555 = 0x22B
• In words: five hundred fifty-five (American usage; “five hundred and fifty-five” in British)
• Is a repdigit in base 10 (three 5s in a row)
• Simple decompositions: 555 = 500 + 50 + 5; also 555 = 111 × 5

A quick practice problem you can try:

• Convert 555 from decimal to base 7 (answer: 1422₇)
• Find gcd(555, 345) and lcm(555, 345)

What would you like to do next—factorization, base conversions, or a short practice set with 555?