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:
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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 [100])
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)

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