81335931138

Names of 81335931138

• Cardinal: 81335931138 can be written as Eighty-one billion, three hundred thirty-five million, nine hundred thirty-one thousand, one hundred thirty-eight.

Scientific notation

• Scientific notation: 8.1335931138 × 10¹⁰

Factors of 81335931138

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 13
• Sum of prime factors: 120

Divisors of 81335931138

• Number of divisors d(n): 378
• Complete list of divisors:
  1 2 3 6 7 9 11 14 18 21 22 27 33 42 49 54 63 66 77 81 97 98 99 121 126 147 154 162 189 194 198 231 242 243 291 294 297 363 378 441 462 486 539 567 582 594 679 693 726 729 847 873 882 891 1067 1078 1089 1134 1323 1358 1386 1458 1617 1694 1701 1746 1782 2037 2079 2134 2178 2541 2619 2646 2673 3201 3234 3267 3402 3969 4074 4158 4753 4851 5082 5103 5238 5346 5929 6111 6237 6402 6534 7469 7623 7857 7938 8019 9409 9506 9603 9702 9801 10206 11737 11858 11907 12222 12474 14259 14553 14938 15246 15714 16038 17787 18333 18711 18818 19206 19602 22407 22869 23474 23571 23814 28227 28518 28809 29106 29403 35211 35574 35721 36666 37422 42777 43659 44814 45738 47142 52283 53361 54999 56133 56454 57618 58806 65863 67221 68607 70422 70713 71442 82159 84681 85554 86427 87318 88209 103499 104566 105633 106722 109998 112266 128331 130977 131726 134442 137214 141426 156849 160083 164318 164997 169362 172854 176418 197589 201663 205821 206998 211266 246477 254043 256662 259281 261954 310497 313698 316899 320166 329994 384993 392931 395178 403326 411642 461041 470547 480249 492954 494991 508086 518562 575113 592767 604989 617463 620994 633798 724493 739431 762129 769986 777843 785862 922082 931491 941094 950697 960498 989982 1138489 1150226 1154979 1185534 1209978 1234926 1383123 1411641 1440747 1448986 1478862 1524258 1555686 1725339 1778301 1814967 1862982 1901394 2173479 2218293 2276978 2286387 2309958 2766246 2794473 2823282 2852091 2881494 3415467 3450678 3464937 3556602 3629934 4149369 4234923 4322241 4346958 4436586 4572774 5071451 5176017 5334903 5444901 5588946 5704182 6520437 6654879 6830934 6859161 6929874 7969423 8298738 8383419 8469846 8556273 8644482 10142902 10246401 10352034 10669806 10889802 12448107 12704769 13040874 13309758 13718322 15214353 15528051 15938846 16004709 16766838 17112546 19561311 19964637 20492802 23908269 24896214 25150257 25409538 30428706 30739203 31056102 32009418 37344321 38114307 39122622 39929274 45643059 46584153 47816538 48014127 50300514 55785961 58683933 59893911 61478406 71724807 74688642 75450771 76228614 91286118 92217609 93168306 96028254 111571922 112032963 117367866 119787822 136929177 139752459 143449614 150901542 167357883 176051799 184435218 215174421 224065926 273858354 276652827 279504918 334715766 336098889 352103598 410787531 419257377 430348842 502073649 528155397 553305654 645523263 672197778 821575062 829958481 838514754 1004147298 1056310794 1232362593 1291046526 1506220947 1659916962 1936569789 2464725186 3012441894 3697087779 3873139578 4518662841 5809709367 7394175558 9037325682 11619418734 13555988523 27111977046 40667965569 81335931138
• Sum of all divisors σ(n): 236325947193
• Sum of proper divisors (its aliquot sum) s(n): 154990016055
• 81335931138 is an abundant number, because the sum of its proper divisors (154990016055) is greater than itself. Its abundance is 73654084917

Bases of 81335931138

• Binary: 1001011101111111111111101000100000010₂
• Hexadecimal: 0x12EFFFD102
• Base-36: 11D5BA4I

Squares and roots of 81335931138

• 81335931138 squared (81335931138²) is 6615533694085477975044
• 81335931138 cubed (81335931138³) is 538080592983255194463994466520072
• The square root of 81335931138 is 285194.5496288455
• The cube root of 81335931138 is 4332.7218997437

Scales and comparisons

• 81,335,931,138 seconds is equal to 2,586 years, 12 weeks, 2 hours, 12 minutes, 18 seconds.
• To count from 1 to 81,335,931,138 would take you about five thousand, one hundred seventy-two 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 81335931138 cubic inches would be around 361.1 feet tall.

Recreational maths with 81335931138

• 81335931138 backwards is 83113953318
• The number of decimal digits it has is: 11
• The sum of 81335931138's digits is 45
• More coming soon!