89

This number is a prime.

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Photo credit: Marsha Greer

The smallest prime formed by the concatenation of consecutive perfect powers in ascending order. [Silva]

89 = 9+8+7+6+5+4+3+2+1+2+3+4+5+6+7+8+9. [Silva]

The only two-digit prime p such that 2^p + p is prime. [Silva]

The only prime formed from unrepeated composite digits. [Silva]

The 5th Fibonacci prime can be expressed by the first 5 integers raised to the first 5 Fibonacci numbers: 1^1 + 2^5 + 3^3 + 4^1 + 5^2. [Silva]

89 minus 8 is the square of 9. Curiously, 89 plus 8 is the next prime after 89. [Silva]