• 143 can be written using four 4's:
143 is nontrivially palindromic in base 12.
143 is an esthetic number in base 15, because in such base its adjacent digits differ by 1.
It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 341 = 11 ⋅31.
It is a cyclic number.
It is an alternating number because its digits alternate between odd and even.
It is a Duffinian number.
143 is a nontrivial repdigit in base 12.
It is a plaindrome in base 6, base 9, base 12 and base 16.
It is a nialpdrome in base 12, base 13, base 14 and base 15.
It is a zygodrome in base 12.
It is a self number, because there is not a number n which added to its sum of digits gives 143.
It is a congruent number.
143 is a gapful number since it is divisible by the number (13) formed by its first and last digit.
143 is a wasteful number, since it uses less digits than its factorization.
143 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 24.
The square root of 143 is about 11.9582607431. The cubic root of 143 is about 5.2293215318.
Subtracting from 143 its product of digits (12), we obtain a palindrome (131).
Adding to 143 its reverse (341), we get a palindrome (484).