89 (Number)

89 is the natural number following 88 and preceding 90.
Cardinaleighty-nine
Ordinal89th (eighty-ninth)
Factorizationprime
Roman numeralLXXXIX
Binary01011001
Hexadecimal59

In mathematics

Eighty-nine is the 24th prime number, following 83 and preceding 97, a Sophie Germain prime. It is the smallest Sophie Germain prime to start a Cunningham chain of the first kind of six terms, {89, 179, 359, 719, 1439, 2879}. 89 is a Fibonacci number. Its reciprocal has a curious relationship to the Fibonacci sequence F(n): \frac{1}{89}=\sum_{n=1}^\infty{F(n)\times 10^{-(n+1)}}=0.011235955... 89 is a highly cototient number.

In science

In astronomy,

In other fields

Eighty-nine is also:

 

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