## 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 (3^{4}) 81 is a perfect square (9x9) (9^{2}) [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 22ndWikipedia.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

`. MathBabbler used Kitt's death to update this nBAB with output obtained from the MBNA (MathBabbler Number Analyst).`

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

`in base-10.`

81

**Creator:** Gerald Thurman
[gthurman@gmail.com]

**Created:** 27 February 2006

This work is licensed under a Creative Commons Attribution 3.0 United States License.