99 (number)

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

In mathematics

99 is:
*a composite number; a square-prime, of the form (''p''², q). It is the 11th composite number of this form and the third of the form (3², q). It has an aliquot sum of 57, within an aliquot sequence of two composite numbers (99, 57, 23, 1,0), to the Prime in the 23-aliquot tree.
*a Kaprekar number
*a lucky number
*a palindromic number in base ten
*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.

* ".99" is frequently used as a price ender in pricing.

See also

* 99 (disambiguation)

References

External links

Integers

{{Num-stub