It is the 10-th Fibonacci number F10.
89 is nontrivially palindromic in base 8.
89 is an esthetic number in base 10 and base 14, because in such bases it adjacent digits differ by 1.
It is a weak prime.
It is a cyclic number.
It is a Sophie Germain prime.
It is a Chen prime.
It is a magnanimous number.
It is a d-powerful number, because it can be written as 92 + 8 .
It is an alternating number because its digits alternate between even and odd.
89 is an undulating number in base 8.
It is a Curzon number.
It is a plaindrome in base 6, base 7, base 10, base 13, base 15 and base 16.
It is a nialpdrome in base 11, base 12 and base 14.
It is a panconsummate number.
It is an amenable number.
89 is an equidigital number, since it uses as much as digits as its factorization.
89 is an evil number, because the sum of its binary digits is even.
The square root of 89 is about 9.4339811321. The cubic root of 89 is about 4.4647450956.