81831811815

Names of 81831811815

• Cardinal: 81831811815 can be written as Eighty-one billion, eight hundred thirty-one million, eight hundred eleven thousand, eight hundred fifteen.

Scientific notation

• Scientific notation: 8.1831811815 × 10¹⁰

Factors of 81831811815

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 11168

Divisors of 81831811815

• Number of divisors d(n): 128
• Complete list of divisors:
  1 3 5 9 13 15 27 31 39 45 65 93 117 135 137 155 195 279 351 403 411 465 585 685 837 1209 1233 1395 1755 1781 2015 2055 3627 3699 4185 4247 5343 6045 6165 8905 10881 10979 12741 16029 18135 18495 21235 26715 32937 38223 48087 54405 54895 55211 63705 80145 98811 114669 142727 164685 165633 191115 240435 276055 296433 340349 428181 494055 496899 573345 713635 828165 1021047 1284543 1482165 1490697 1504123 1701745 2140905 2484495 3063141 3853629 4424537 4512369 5105235 6422715 7453485 7520615 9189423 13273611 13537107 15315705 19268145 19553599 22122685 22561845 39820833 40611321 45947115 46627813 58660797 66368055 67685535 97767995 119462499 139883439 175982391 199104165 203056605 233139065 293303985 419650317 527947173 597312495 606161569 699417195 879911955 1258950951 1818484707 2098251585 2639735865 3030807845 5455454121 6294754755 9092423535 16366362363 27277270605 81831811815
• Sum of all divisors σ(n): 162918604800
• Sum of proper divisors (its aliquot sum) s(n): 81086792985
• 81831811815 is a deficient number, because the sum of its proper divisors (81086792985) is less than itself. Its deficiency is 745018830

Bases of 81831811815

• Binary: 1001100001101100011100101101011100111₂
• Hexadecimal: 0x130D8E5AE7
• Base-36: 11LCJQ3R

Squares and roots of 81831811815

• 81831811815 squared (81831811815²) is 6696445424925573594225
• 81831811815 cubed (81831811815³) is 547982261841927248743553370768375
• The square root of 81831811815 is 286062.6012169363
• The cube root of 81831811815 is 4341.5091662851

Scales and comparisons

• 81,831,811,815 seconds is equal to 2,601 years, 51 weeks, 6 days, 10 hours, 50 minutes, 15 seconds.
• To count from 1 to 81,831,811,815 would take you about five thousand, two hundred three 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 81831811815 cubic inches would be around 361.8 feet tall.

Recreational maths with 81831811815

• 81831811815 backwards is 51811813818
• 81831811815 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 81831811815's digits is 45
• More coming soon!