31391019891

Names of 31391019891

• Cardinal: 31391019891 can be written as Thirty-one billion, three hundred ninety-one million, nineteen thousand, eight hundred ninety-one.

Scientific notation

• Scientific notation: 3.1391019891 × 10¹⁰

Factors of 31391019891

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 174951

Divisors of 31391019891

• Number of divisors d(n): 72
• Complete list of divisors:
  1 3 7 9 11 21 33 37 49 63 77 99 111 147 231 259 333 407 441 539 693 777 1221 1617 1813 2331 2849 3663 4851 5439 8547 16317 19943 25641 59829 174893 179487 524679 1224251 1574037 1923823 3672753 5771469 6471041 8569757 11018259 13466761 17314407 19413123 25709271 40400283 45297287 58239369 71181451 77127813 94267327 121200849 135891861 213544353 282801981 317081009 407675583 498270157 640633059 848405943 951243027 1494810471 2853729081 3487891099 4484431413 10463673297 31391019891
• Sum of all divisors σ(n): 59095983024
• Sum of proper divisors (its aliquot sum) s(n): 27704963133
• 31391019891 is a deficient number, because the sum of its proper divisors (27704963133) is less than itself. Its deficiency is 3686056758

Bases of 31391019891

• Binary: 11101001111000011001111001101110011₂
• Hexadecimal: 0x74F0CF373
• Base-36: EF5EHYR

Squares and roots of 31391019891

• 31391019891 squared (31391019891²) is 985396129797157651881
• 31391019891 cubed (31391019891³) is 30932589510976993645459324564971
• The square root of 31391019891 is 177175.1108113101
• The cube root of 31391019891 is 3154.5334870799

Scales and comparisons

• 31,391,019,891 seconds is equal to 998 years, 7 weeks, 23 hours, 44 minutes, 51 seconds.
• To count from 1 to 31,391,019,891 would take you about one thousand, nine hundred ninety-six 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 31391019891 cubic inches would be around 262.9 feet tall.

Recreational maths with 31391019891

• 31391019891 backwards is 19891019313
• The number of decimal digits it has is: 11
• The sum of 31391019891's digits is 45
• More coming soon!