### About the Number 89 (eighty-nine)

Paul Harvey died at the age of 90. MathBabbler already had a nBAB for the number 90, but he didn't have a nBab for the numbers `89` and 91. This nBAB is for the number `89`.

```   MathBabbler Number Analyst (MBNA) output:
=========================================
89 is a natural, whole, integer
89 is odd
89 proper divisors are: 1,
89 is deficient (sum of divisors is 1)
89 is unhappy
89 is not a Harshad number
89 is prime
...Sexy prime with 83
...Sophie Germain prime with 179
...Pythagorean
89 is undulating
89 is a Fibonacci number
89 in octal is 0131
89 in binary is 1011001 (is evil)
89 nearest square numbers: -8...11 (81...100 [10])
sqrt(89) = 9.43398
ln(89) = 4.48864
log(89) = 1.94939
89 reciprocal is .01123595505617977528089887640449
89! is 1.6508e+136
89 is 28.3296 Pi years
89 is 4 score and 9 years
89 written as a Roman numeral is LXXXIX
```

##### Update::2014.01.17

Russell Johnson, who played The Professor on Gilligan's Island, died on 16 January 2014 at the age of 89.

Updated MBNA output.

```   89 is a natural, whole, integer
89 is odd
89 proper divisors are: 1,
89 has 1 proper divisors
89 is deficient (sum of divisors is 1; ratio: 0.011236)
89 is unhappy
89 is a Squarefree Number
89 is prime
...Sexy prime with 83
...Sophie Germain prime with 179
...Truman Gerald prime with 59
...Pythagorean
...Eisenstein
89 is undulating
89 is a Fibonacci number
89 in octal is 0131
89 in binary is 1011001 (is evil)
89 nearest square numbers: -8...11 (81...100 [10])
sqrt(89) = 9.43398
ln(89) = 4.48864
log(89) = 1.94939
89 reciprocal is .01123595505617977528089887640449
89 is 28.3296 Pi years
89 is 4 score and 9 years
89 written as a Roman numeral is LXXXIX
89 is 45^2 - 44^2 and 45 + 44 = 89
```

Creator: Gerald Thurman [gthurman@gmail.com]
Created: 01 March 2009