991989999
991,989,999 is an odd composite number composed of six prime numbers multiplied together.
991989999 is an odd composite number. It is composed of six distinct prime numbers multiplied together. It has a total of ninety-six divisors.
Prime factorization of 991989999:
32 × 7 × 11 × 13 × 149 × 739
(3 × 3 × 7 × 11 × 13 × 149 × 739)See below for interesting mathematical facts about the number 991989999 from the Numbermatics database.
Names of 991989999
- Cardinal: 991989999 can be written as Nine hundred ninety-one million, nine hundred eighty-nine thousand, nine hundred ninety-nine.
Scientific notation
- Scientific notation: 9.91989999 × 108
Factors of 991989999
Divisors of 991989999
- Number of divisors d(n): 96
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Complete list of divisors:
1 3 7 9 11 13 21 33 39 63 77 91 99 117 143 149 231 273 429 447 693 739 819 1001 1043 1287 1341 1639 1937 2217 3003 3129 4917 5173 5811 6651 8129 9009 9387 9607 11473 13559 14751 15519 17433 21307 24387 28821 34419 40677 46557 56903 63921 67249 73161 86463 103257 105677 110111 122031 149149 170709 191763 201747 317031 330333 447447 512127 605241 739739 770777 951093 990999 1211221 1342341 1431443 2219217 2312331 3633663 4294329 6657651 6936993 8478547 10020101 10900989 12882987 15745873 25435641 30060303 47237619 76306923 90180909 110221111 141712857 330663333 991989999
- Sum of all divisors σ(n): 1939392000
- Sum of proper divisors (its aliquot sum) s(n): 947402001
- 991989999 is a deficient number, because the sum of its proper divisors (947402001) is less than itself. Its deficiency is 44587998
Bases of 991989999
- Binary: 1110110010000010010000111011112
- Hexadecimal: 0x3B2090EF
- Base-36: GELSDR
Squares and roots of 991989999
- 991989999 squared (9919899992) is 984044158116020001
- 991989999 cubed (9919899993) is 976161963425466522675969999
-
The
square root of 991989999 is 31495.8727296133 -
The
cube root of 991989999 is 997.3228388709
Scales and comparisons
How big is 991989999?- 991,989,999 seconds is equal to 31 years, 28 weeks, 1 day, 8 hours, 46 minutes, 39 seconds.
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To count from 1 to 991,989,999 would take you about forty-seven 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 991989999 cubic inches would be around 83.1 feet tall.
Recreational maths with 991989999
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