Thursday, April 2, 2009

89

89 is a prime number.

89 is the smallest prime whose digits, 8 and 9, are composites.

89 is the eleventh Fibonacci number.

89 is the only two-digit number that is the sum of its first digit and its second digit squared: 8 + 92 = 89.

A sunflower head often displays florets in spirals of 55 and 89 around the outside.

Source: Number Gossip

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