99

Names of 99

• Cardinal: 99 can be written as Ninety-nine.

Scientific notation

• Scientific notation: 9.9 × 10¹

Factors of 99

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 14

Divisors of 99

• Number of divisors d(n): 6
• Complete list of divisors:
  1 3 9 11 33 99
• Sum of all divisors σ(n): 156
• Sum of proper divisors (its aliquot sum) s(n): 57
• 99 is a deficient number, because the sum of its proper divisors (57) is less than itself. Its deficiency is 42

Bases of 99

• Binary: 1100011₂
• Hexadecimal: 0x63
• Base-36: 2R

Squares and roots of 99

• 99 squared (99²) is 9801
• 99 cubed (99³) is 970299
• The square root of 99 is 9.9498743707
• The cube root of 99 is 4.6260650091

Scales and comparisons

• 99 seconds is equal to 1 minute, 39 seconds.
• To count from 1 to 99 would take you about forty-nine seconds.

  This is a very rough estimate, based on a speaking rate of half a second every third order of magnitude. If you speak quickly, you could probably say any randomly-chosen number between one and a thousand in around half a second. Very big numbers obviously take longer to say, so we add half a second for every extra x1000. (We do not count involuntary pauses, bathroom breaks or the necessity of sleep in our calculation!)

• A cube with a volume of 99 cubic inches would be around 0.4 feet tall.

Recreational maths with 99

• 99 is the same when its digits are reversed! That makes it a palindromic number.
• The number of decimal digits it has is: 2
• The sum of 99's digits is 18
• More coming soon!