• 143 can be written using four 4's:

143 has 4 divisors (see below), whose sum is σ = 168. Its totient is φ = 120.

The previous prime is 139. The next prime is 149. The reversal of 143 is 341.

Added to its reverse (341) it gives a square (484 = 22^{2}).

143 is nontrivially palindromic in base 12.

It is a Cunningham number, because it is equal to 12^{2}-1.

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 not a de Polignac number, because 143 - 2^{2} = 139 is a prime.

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.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5 + ... + 17.

It is an arithmetic number, because the mean of its divisors is an integer number (42).

143 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

143 is a deficient number, since it is larger than the sum of its proper divisors (25).

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 product of its digits is 12, while the sum is 8.

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).

It can be divided in two parts, 1 and 43, that added together give a palindrome (44).

The spelling of 143 in words is "one hundred forty-three", and thus it is an aban number and an iban number.

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