### About the Number 225 (two hundred twenty-five)

MathBabbler posted nBABs for the square numbers 196 and 169 on 21 July 2009 and 22 July 2009, respectively. 196 and 169 are both square numbers. The nBAB for the number 169 was nBAB number 224, which meant the next nBAB would be nBAB number `225` and `225` is a square number.

```   MathBabbler Number Analyst (MBNA) output:
=========================================
225 is a natural, whole, integer
225 is odd
225 proper divisors are: 1,3,5,9,15,25,45,75,
225 is refactorable (evenly divisable by # of divisors)
225 is deficient (sum of divisors is 178)
225 is unhappy
225 is a Harshad number
225 is not prime
225 has the prime factors: 3*3*5*5 (sum=16)
225 sum of prime factors is: 16
225 is ThurmNumber
225 in octal is 0341
225 in hexadecimal is 0xe1
225 in binary is 11100001 (is evil)
225 nearest square numbers: 225 is square (225 is square)
sqrt(225) = 15
ln(225) = 5.4161
log(225) = 2.35218
225 is 15^2
225 reciprocal is .00444444444444444444444444444444
225! is 1.25936e+433
225 is 71.6197 Pi years
225 is 11 score and 5 years
225 written as a Roman numeral is CCXXV
```

On 20 July 2009 (i.e. two days prior to this nBAB being created), MathBabbler defined the ThurmNumber and `225` is a ThurmNumber because `225` is 11 score 5 and both 11 and 5 are prime numbers.

This nBAB was created using a version of the MBNA that didn't check for powerful numbers. `225` is a powerful number. {OEIS.org::id:A001694}

Creator: Gerald Thurman [gthurman@gmail.com]
Created: 22 July 2009 