1179

1179 is a natural number that follows 1178 and precedes 1180. In prime factorization terms, 1179 = 3^2 × 131. Its positive divisors are 1, 3, 9, 131, 393, and 1179, giving it six divisors. The sum of its proper divisors is 537, which is less than 1179, so 1179 is a deficient number. In different numeral systems, it is written as 1179 in decimal, 0x49B in hexadecimal, and 10010011011 in binary; in Roman numerals it is MCLXXIX.

Historically, the year AD 1179 is notable for the Third Lateran Council held in Rome and convened by Pope Alexander III. The council enacted reforms aimed at strengthening church governance and discipline, including provisions on clerical morality and the process for electing popes. It affirmed that the pope would be elected by the College of Cardinals with a two-thirds majority and intensified measures against heresy and ecclesiastical abuses, contributing to the consolidation of papal authority during a period of factional conflict within Christendom.

As a calendar year, 1179 sits in the late 12th century and is referenced in medieval chronologies and historical studies of church reform. The number itself also appears in mathematical discussions as an example of a composite, deficient number with a simple prime factorization, illustrating concepts such as factorization, divisor count, and base conversions.