1291

Names of 1291

• Cardinal: 1291 can be written as One thousand, two hundred ninety-one.

Scientific notation

• Scientific notation: 1.291 × 10³

Factors of 1291

• Number of distinct prime factors ω(n): 1
• Total number of prime factors Ω(n): 1
• Sum of prime factors: 1291

Divisors of 1291

• Number of divisors d(n): 2
• Complete list of divisors:
  1 1291
• Sum of all divisors σ(n): 1292
• Sum of proper divisors (its aliquot sum) s(n): 1
• 1291 is a deficient number, because the sum of its proper divisors (1) is less than itself. Its deficiency is 1290

Bases of 1291

• Binary: 10100001011₂
• Hexadecimal: 0x50B
• Base-36: ZV

Squares and roots of 1291

• 1291 squared (1291²) is 1666681
• 1291 cubed (1291³) is 2151685171
• The square root of 1291 is 35.9304884465
• The cube root of 1291 is 10.8886844949

Scales and comparisons

• 1,291 seconds is equal to 21 minutes, 31 seconds.
• To count from 1 to 1,291 would take you about twenty-one minutes.

  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 1291 cubic inches would be around 0.9 feet tall.

Recreational maths with 1291

• 1291 backwards is 1921
• The number of decimal digits it has is: 4
• The sum of 1291's digits is 13
• More coming soon!