981

Names of 981

• Cardinal: 981 can be written as Nine hundred eighty-one.

Scientific notation

• Scientific notation: 9.81 × 10²

Factors of 981

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 112

Divisors of 981

• Number of divisors d(n): 6
• Complete list of divisors:
  1 3 9 109 327 981
• Sum of all divisors σ(n): 1430
• Sum of proper divisors (its aliquot sum) s(n): 449
• 981 is a deficient number, because the sum of its proper divisors (449) is less than itself. Its deficiency is 532

Bases of 981

• Binary: 1111010101₂
• Hexadecimal: 0x3D5
• Base-36: R9

Squares and roots of 981

• 981 squared (981²) is 962361
• 981 cubed (981³) is 944076141
• The square root of 981 is 31.3209195267
• The cube root of 981 is 9.9362612673

Scales and comparisons

• 981 seconds is equal to 16 minutes, 21 seconds.
• To count from 1 to 981 would take you about eight 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 981 cubic inches would be around 0.8 feet tall.

Recreational maths with 981

• 981 backwards is 189
• The number of decimal digits it has is: 3
• The sum of 981's digits is 18
• More coming soon!