Girish Mahajan (Editor)

99 (number)

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99
  
100 →

Ordinal
  
99th (ninety-ninth)

Roman numeral
  
XCIX

Cardinal
  
ninety-nine

Factorization
  
3× 11

Binary
  
11000112

99 (ninety-nine) is the natural number following 98 and preceding 100.

Contents

In mathematics

99 is:

  • a Kaprekar number
  • a lucky number
  • a palindromic number
  • the ninth repdigit
  • the sum of the cubes of three consecutive integers: 99 = 23 + 33 + 43
  • the sum of the sums of the divisors of the first 11 positive integers.

    • In science

  • The atomic number of Einsteinium, an actinide.

    • People

  • 九九（Sophie Chen） , c-pop singer-songwriter from Canada

    • References

    99 (number) Wikipedia
    (Text) CC BY-SA