89

This number is a prime.

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Photo credit: Marsha Greer

Y-89 is the only naturally occurring stable isotope of Yttrium. [Homewood]

There are 89 three-digit isolated (i.e., not part of a twin prime pair) prime numbers. [Homewood]

If A = 1, B = 6, C = 1, D = 8, ... , (using the digits of the Golden Ratio), then 'MERSENNE PRIME NUMBER' = 89; a Mersenne prime exponent that Mersenne himself missed! [Homewood]

If A = 1, B = 2, C = 3,..., Z = 26, then VIRGINIA is prime. [Homewood]