281

Names of 281

• Cardinal: 281 can be written as Two hundred eighty-one.

Scientific notation

• Scientific notation: 2.81 × 10²

Factors of 281

• Number of distinct prime factors ω(n): 1
• Total number of prime factors Ω(n): 1
• Sum of prime factors: 281

Divisors of 281

• Number of divisors d(n): 2
• Complete list of divisors:
  1 281
• Sum of all divisors σ(n): 282
• Sum of proper divisors (its aliquot sum) s(n): 1
• 281 is a deficient number, because the sum of its proper divisors (1) is less than itself. Its deficiency is 280

Bases of 281

• Binary: 100011001₂
• Hexadecimal: 0x119
• Base-36: 7T

Squares and roots of 281

• 281 squared (281²) is 78961
• 281 cubed (281³) is 22188041
• The square root of 281 is 16.7630546143
• The cube root of 281 is 6.5499116201

Scales and comparisons

• 281 seconds is equal to 4 minutes, 41 seconds.
• To count from 1 to 281 would take you about two 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 281 cubic inches would be around 0.5 feet tall.

Recreational maths with 281

• 281 backwards is 182
• 281 is a twin prime! Its twin is 283
• The number of decimal digits it has is: 3
• The sum of 281's digits is 11
• More coming soon!