Numbers 1080-1099

 A page of the Numeropedia - the Special Encyclopedia of Numbers

1000-1099   1100-1199    1200-1299   1300-1399   1400-1499

 1500-1599   1600-1699   1700-1799    1800-1899   1900-1999

All Numbers  & [1K…) * [2K…) * [3K…) * [4K…) * [5K…) * [6K…) * [7K…) * [8K…) *  [9K…)  & [10K] & [100K]

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1,080

[Math.]  Sum (in degrees) of all internal angles of an 8-side polygon.

 

[Zip]  U.S. Postal Zip Code: Three Rivers, Massachusetts 01080.

 

1,081

[Math.]  A triangular number (sum of all integers from 1 to 46): 1081 = 1+2+…+45+46.

 

1,087

[Math.]  A prime number.

 

1,088

[Science]  The speed of sound or Mach 1.0, (ft/s, feet/second) or 331.6 m/s (meters/second), at 0 oC and 1 atm (atmosphere). This speed is not a constant, depending on the density, temperature and pressure of the environment it is traveling by.

 

1,089

[Math.]  1089 = 81+92+103.

 

[Math.]  652–562 = 1089 = 332, 65+56 = 121 = 112 and 65–56 = 9 = 32 the only 2-digit relationship of this type.

 

[Math.]  This number is equal to the sum of a number (which is calculated by the difference between any 3-different-digit number and its digit-reversal number) and its digit-reversal number.

 

[Math.]

(*)   332×9 = 1089×9 = 9,801 = 992 & 1089×9801 = 10,673,289 = 32672

1089…1089×9 = 9801…9801  & 1089…1089×9801…9801  = 3267…32672

 

(**)  10989×9 = 98901 & 10989×98901 = 1,086,823,089 = 329672

10989…10989×9 = 98901…98901 & 10989…10989×98901...98901 = 32967…329672

 

(***)   109989×9 = 989901 & 109989×989901 = 108,878,221,089 = 3299672

109989…109989×9 = 989901…989901 &

109989…109989×989901...989901 = 329967…3299672

(****)  109…989×9 = 989…901 & 109...989×989…901 = 329…9672

 109…989...109…989×9 = 989…901...989…901  &

  109…989…109…989×989…901...989…901 = 329…967…329…9672.

  

1,091

[Math.]  A prime number.

 

1,093

[Math.]  A prime number.  One of only known Wieferich prime numbers, which are prime numbers p such that (2p–1–1) is divisible by p2. The other number is 3511.

 

1,093.6

[Measure]  1,093.6 yards = 1 km (kilometer).

(U.S. customary and metric units for linear measures).

 

1,098

[Math.]  1,098 = 11+0+999+88.

 

1,099

[Math.]  1,099 = 1+0+999+99. 

 

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1080-1099 (separate page)