Subtracting 31868 from its reverse (86813), we obtain a palindrome (54945).
31868 is an undulating number in base 16.
It is a nialpdrome in base 14.
It is a zygodrome in base 2.
It is a congruent number.
It is an unprimeable number.
31868 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
231868 is an apocalyptic number.
It is an amenable number.
31868 is a wasteful number, since it uses less digits than its factorization.
31868 is an evil number, because the sum of its binary digits is even.
The square root of 31868 is about 178.5161057160. The cubic root of 31868 is about 31.7043073489.
The spelling of 31868 in words is "thirty-one thousand, eight hundred sixty-eight".