2181

Names of 2181

• Cardinal: 2181 can be written as Two thousand, one hundred eighty-one.

Scientific notation

• Scientific notation: 2.181 × 10³

Factors of 2181

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 730

Divisors of 2181

• Number of divisors d(n): 4
• Complete list of divisors:
  1 3 727 2181
• Sum of all divisors σ(n): 2912
• Sum of proper divisors (its aliquot sum) s(n): 731
• 2181 is a deficient number, because the sum of its proper divisors (731) is less than itself. Its deficiency is 1450

Bases of 2181

• Binary: 100010000101₂
• Hexadecimal: 0x885
• Base-36: 1OL

Squares and roots of 2181

• 2181 squared (2181²) is 4756761
• 2181 cubed (2181³) is 10374495741
• The square root of 2181 is 46.7011777153
• The cube root of 2181 is 12.9683648939

Scales and comparisons

• 2,181 seconds is equal to 36 minutes, 21 seconds.
• To count from 1 to 2,181 would take you about thirty-six minutes.

  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 2181 cubic inches would be around 1.1 feet tall.

Recreational maths with 2181

• 2181 backwards is 1812
• The number of decimal digits it has is: 4
• The sum of 2181's digits is 12
• More coming soon!