• Probably 259 is the largest number that can be written in two ways as 2x + 3y. Here 259 = 28 + 31 = 24 + 35.
• 259 can be written using four 4's:
259 is nontrivially palindromic in base 6.
It is a semiprime because it is the product of two primes.
It is a 3-Lehmer number, since φ(259) divides (259-1)3.
It is a cyclic number.
It is a deceptive number, since it divides R258.
It is a Duffinian number.
259 is a lucky number.
259 is a nontrivial repdigit in base 6.
It is a plaindrome in base 6, base 10, base 13, base 14 and base 15.
It is a nialpdrome in base 6 and base 7.
It is a zygodrome in base 6.
259 is an equidigital number, since it uses as much as digits as its factorization.
259 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 44.
The square root of 259 is about 16.0934769394. The cubic root of 259 is about 6.3743110879.
Subtracting from 259 its sum of digits (16), we obtain a 5-th power (243 = 35).
Subtracting from 259 its product of digits (90), we obtain a square (169 = 132).
The spelling of 259 in words is "two hundred fifty-nine", and thus it is an aban number.