portrait: 89

89 is: the 24th prime number, following 83 and preceding 97. a Chen prime. a Pythagorean prime. the smallest Sophie Germain prime to start a Cunningham chain of the first kind of six terms, {89, 179, 359, 719, 1439, 2879}. an Eisenstein prime with no imaginary part and real part of the form 3n − 1. a Fibonacci number and thus a Fibonacci prime as well.[3] The first few digits of its reciprocal coincide with the Fibonacci sequence due to the identity.