991899867021

Names of 991899867021

• Cardinal: 991899867021 can be written as Nine hundred ninety-one billion, eight hundred ninety-nine million, eight hundred sixty-seven thousand and twenty-one.

Scientific notation

• Scientific notation: 9.91899867021 × 10¹¹

Factors of 991899867021

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 4079

Divisors of 991899867021

• Number of divisors d(n): 96
• Complete list of divisors:
  1 3 7 19 21 49 57 133 147 343 361 399 829 931 1029 1083 2487 2527 2793 3221 5803 6517 7581 9663 15751 17409 17689 19551 22547 40621 47253 53067 61199 67641 110257 121863 123823 157829 183597 284347 299269 330771 371469 428393 473487 771799 853041 897807 1104803 1162781 1285179 2094883 2315397 2670209 2998751 3314409 3488343 5402593 6284649 8010627 8139467 8996253 14664181 16207779 18691463 20991257 24418401 43992543 50733971 56074389 56976269 62973771 102649267 130840241 152201913 170928807 307947801 355137797 392520723 398833883 915881687 963945449 1065413391 1196501649 2485964579 2747645061 2891836347 6747618143 7457893737 17401752053 20242854429 47233327001 52205256159 141699981003 330633289007 991899867021
• Sum of all divisors σ(n): 1630228896000
• Sum of proper divisors (its aliquot sum) s(n): 638329028979
• 991899867021 is a deficient number, because the sum of its proper divisors (638329028979) is less than itself. Its deficiency is 353570838042

Bases of 991899867021

• Binary: 1110011011110001110101101101011110001101₂
• Hexadecimal: 0xE6F1D6D78D
• Base-36: CNO7KJNX

Squares and roots of 991899867021

• 991899867021 squared (991899867021²) is 983865346196277483414441
• 991899867021 cubed (991899867021³) is 975895906058657763964000560931050261
• The square root of 991899867021 is 995941.6986053953
• The cube root of 991899867021 is 9972.9263244947

Scales and comparisons

• 991,899,867,021 seconds is equal to 31,539 years, 18 weeks, 12 hours, 50 minutes, 21 seconds.
• To count from 1 to 991,899,867,021 would take you about sixty-three thousand and seventy-eight years!

  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 991899867021 cubic inches would be around 831.1 feet tall.

Recreational maths with 991899867021

• 991899867021 backwards is 120768998199
• The number of decimal digits it has is: 12
• The sum of 991899867021's digits is 69
• More coming soon!