89

Math

is the integer between.

Math features

 * is an odd number.
 * 89 is a prime number and a deficient number.
 * 89 is the sum of 2 square numbers: \(89=8^2+5^2\).
 * 89 is a Fibonacci number, equal to F11.

&frac12;

 * $1⁄2$ is half of, another prime number.