81013

Names of 81013

• Cardinal: 81013 can be written as Eighty-one thousand and thirteen.

Scientific notation

• Scientific notation: 8.1013 × 10⁴

Factors of 81013

• Number of distinct prime factors ω(n): 1
• Total number of prime factors Ω(n): 1
• Sum of prime factors: 81013

Divisors of 81013

• Number of divisors d(n): 2
• Complete list of divisors:
  1 81013
• Sum of all divisors σ(n): 81014
• Sum of proper divisors (its aliquot sum) s(n): 1
• 81013 is a deficient number, because the sum of its proper divisors (1) is less than itself. Its deficiency is 81012

Bases of 81013

• Binary: 10011110001110101₂
• Hexadecimal: 0x13C75
• Base-36: 1QID

Squares and roots of 81013

• 81013 squared (81013²) is 6563106169
• 81013 cubed (81013³) is 531696920069197
• The square root of 81013 is 284.6278271709
• The cube root of 81013 is 43.2698017069

Scales and comparisons

• 81,013 seconds is equal to 22 hours, 30 minutes, 13 seconds.
• To count from 1 to 81,013 would take you about twenty-two hours.

  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 81013 cubic inches would be around 3.6 feet tall.

Recreational maths with 81013

• 81013 backwards is 31018
• The number of decimal digits it has is: 5
• The sum of 81013's digits is 13
• More coming soon!