About the Number 81 (eighty-one)

Why Babble About 81?

On 24 February 2006, Dennis Weaver died at the age of 81.

On 24 February 2006, Don Knotts died at the age of 81.

[side-bar] On 25 February 2006, Darren McGavin died at the age of 83.

For many years, I have predicted my death date to be 18 January 2038. If this holds true, then I will die at the age of 81. { countdowns to special GDT dates} {tombstone}

About 81
   81 is positive
   81 is odd
   81 is the opposite of -81
   81 prime factorization is 3 3 3 3 (34)
   81 is a perfect square (9x9) (92)
      [perfect square is a number whose square root is an integer]
      
   the sum of the digits of 81 equals the sqrt(81)
      [8+1 = sqrt(81) = 9]

   81st day of a non-leap year is on March 22nd

Wikipedia.org:: 81 (number)

81 + 1 equals 82

RoadHacker Nanofoo
   Interstate 81 passes through Tennessee, Virginia,
      West Virginia, Maryland, Pennsylvania, New York
   US Hwy-81 passes through North Dakota, South Dakota,
      Nebraska, Kansas, Oklahoma, and Texas
   AZ Hwy-81 existed from 1927-1938 [source: ArizonaRoads.com]
Update::2008.12.26

Eartha Kitt died on 25 December 2008 at the age of 81. MathBabbler used Kitt's death to update this nBAB with output obtained from the MBNA (MathBabbler Number Analyst).

   MathBabbler Number Analyst (MBNA) output:
   =========================================
   81 is a natural, whole, integer
   81 is odd
   81 proper divisors are: 1,3,9,27,
   81 is deficient (sum of divisors is 40)
   81 is unhappy
   81 is a Harshad number
   81 is not prime
   81 is undulating
   81 has the prime factors: 3*3*3*3
   81 in octal is 0121
   81 in hexadecimal is 0x51
   81 in binary is 1010001 (is odious)
   81 nearest square numbers: 81 is square (81 is square)
   sqrt(81) = 9
   ln(81) = 4.39445
   log(81) = 1.90849
   81 is 3^4
   81 is 9^2
   81 reciprocal is .01234567901234567901234567901234
   81! is 5.79713e+120
   81 is 25.7831 Pi years
   81 is 4 score and 1 year
   81 written as a Roman numeral is LXXXI

MathBabbler was 51 years young with Eartha died. 51 in base-16 is 81 in base-10.


Creator: Gerald Thurman [gthurman@gmail.com]
Created: 27 February 2006

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