### About the Number 9,999 (nine thousand nine hundred ninety-nine)

This nBAB for the number 9999 was created after nBABs for the numbers 1818 and 8181 were created. The sum of 1818 and 8181 is 9999.

```MathBabbler Number Analyst (MBNA) output:
=========================================
9999 is a natural, whole, integer
9999 is odd
9999 proper divisors are: 1,3,9,11,33,99,101,303,909,1111,3333,
9999 has 11 proper divisors
9999 is deficient (sum of divisors is 5913; ratio: 0.591359)
9999 is unhappy
9999 is not a Squarefree Number: 9,
9999 is composite (not prime)
9999 has the prime factors: 3*3*11*101 (sum=118)
9999 is undulating
9999 is palindromic
9999 has all palindromic proper divisors (1,3,9,11,33,99,101,303,909,1111,3333)
9999 is repdigit in base-10
9999 is Kaprekar number
9999 is a lucky number
9999 is Arithmetic (A003601)
9999 is ThurmNumber
9999 is the sum of 31 consecutive primes
9999 = 233 + 239 + 241 + 251 + 257 + 263 + 269 + 271 + 277 + 281 + 283 +
293 + 307 + 311 + 313 + 317 + 331 + 337 + 347 + 349 + 353 + 359 +
367 + 373 + 379 + 383 + 389 + 397 + 401 + 409 + 419
9999 in octal is 023417
9999 in hexadecimal is 0x270f
9999 in binary is 10011100001111 (is evil)
9999 nearest square numbers: -198...1 (9801...10000 )
sqrt(9999) = 99.995
ln(9999) = 9.21024
log(9999) = 3.99996
9999 reciprocal is .00010001000100010001000100010001
9999 is an apocalyptic power
9999! is inf
9999 is 3182.78 Pi years
9999 is 499 score and 19 years
9999 is 5000^2 - 4999^2 and 5000 + 4999 = 9999
9999 is a multiple of 9 & it contains a 9 (A121029)
9999 is a multiple of 99 & it contains a 99
```

Creator: Gerald Thurman [gthurman@gmail.com]
Created: 06 May 2015 (posted 07 May 2015) 