1991687139

Names of 1991687139

• Cardinal: 1991687139 can be written as One billion, nine hundred ninety-one million, six hundred eighty-seven thousand, one hundred thirty-nine.

Scientific notation

• Scientific notation: 1.991687139 × 10⁹

Factors of 1991687139

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 253

Divisors of 1991687139

• Number of divisors d(n): 108
• Complete list of divisors:
  1 3 9 13 17 23 39 51 69 117 153 169 197 207 221 289 299 391 507 591 663 867 897 1173 1521 1773 1989 2561 2601 2691 2873 3349 3519 3757 3887 4531 5083 6647 7683 8619 10047 11271 11661 13593 15249 19941 23049 25857 30141 33293 33813 34983 40779 43537 45747 48841 56933 58903 59823 66079 77027 86411 99879 130611 146523 170799 176709 198237 231081 259233 299637 391833 439569 512397 530127 565981 594711 693243 740129 765739 777699 1001351 1123343 1309459 1697943 2220387 2297217 3004053 3370029 3928377 5093829 6661161 6891651 9012159 9621677 10110087 11785131 13017563 17022967 28865031 39052689 51068901 86595093 117158067 153206703 221298571 663895713 1991687139
• Sum of all divisors σ(n): 3470637456
• Sum of proper divisors (its aliquot sum) s(n): 1478950317
• 1991687139 is a deficient number, because the sum of its proper divisors (1478950317) is less than itself. Its deficiency is 512736822

Bases of 1991687139

• Binary: 1110110101101101011101111100011₂
• Hexadecimal: 0x76B6BBE3
• Base-36: WXSRMR

Squares and roots of 1991687139

• 1991687139 squared (1991687139²) is 3966817659658005321
• 1991687139 cubed (1991687139³) is 7900659715498928336229266619
• The square root of 1991687139 is 44628.3221620531
• The cube root of 1991687139 is 1258.1730343921

Scales and comparisons

• 1,991,687,139 seconds is equal to 63 years, 17 weeks, 22 hours, 25 minutes, 39 seconds.
• To count from 1 to 1,991,687,139 would take you about one hundred twenty-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 1991687139 cubic inches would be around 104.8 feet tall.

Recreational maths with 1991687139

• 1991687139 backwards is 9317861991
• The number of decimal digits it has is: 10
• The sum of 1991687139's digits is 54
• More coming soon!