This nBAB for the number

9999was created after nBABs for the numbers 1818 and 8181 were created. The sum of 1818 and 8181 is9999.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 [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)

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