99 (number)

From Wikipedia, the free encyclopedia
This article is about the number. For other uses, see 99 (disambiguation).
← 98 99 100 →
← 90 91 92 93 94 95 96 97 98 99 →
List of numbers — Integers
← 0 10 20 30 40 50 60 70 80 90 →
Cardinalninety-nine
Ordinal99th
(ninety-ninth)
Factorization32 × 11
Divisors1, 3, 9, 11, 33, 99
Greek numeralϞΘ´
Roman numeralXCIX
Binary11000112
Ternary102003
Octal1438
Duodecimal8312
Hexadecimal6316
Chinese/Japanese
/Korean numeral		九十九

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

In mathematics[]

99 is:

  • a Kaprekar number[1]
  • 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.[2]
  • the highest two digit number in decimal.

In science[]

  • The atomic number of einsteinium, an actinide.

References[]

  1. ^ "Sloane's A006886 : Kaprekar numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28.
  2. ^ Sloane, N. J. A. (ed.). "Sequence A024916 (sum_{k=1..n} sigma(k) where sigma(n) = sum of divisors of n)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.

External links[]

Media related to 99 (number) at Wikimedia Commons

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