1143

1143 is a natural number that follows 1142 and precedes 1144. In Roman numerals it is MCXLIII. In binary it is 10001110111.

Mathematically, 1143 is an odd composite number. Its prime factorization is 3^2 × 127, so its divisors are 1, 3, 9, 127, 381, and 1143. It is divisible by 9 because the sum of its digits is 9. Consequently, it is a Harshad (Niven) number in base 10. It is congruent to 3 modulo 4.

In history, the year 1143 CE saw the Treaty of Zamora between the kingdoms of León and Portugal, an important step toward Portugal's independence and a notable event in the medieval Iberian Peninsula.

As a numeral, 1143 also serves as a reference point in various counting systems, catalogs, and datasets where a four-digit identifier is used. Its Roman, binary, and decimal representations illustrate how a single number can be expressed across different notations and contexts.