0193

0193 is a four-digit string consisting of the digits 0, 1, 9, and 3. In standard decimal notation it represents the number 193; the leading zero does not affect arithmetic value, but it often serves as a fixed-width indicator in data formats, serial numbers, or identifiers.

In mathematics, 193 is a prime number, having no divisors other than 1 and itself. It is the 44th prime. The sum of its digits is 13, and its primality remains true in any base representation that treats 193 as the same positive integer.

As a year, 193 CE is associated with a period of political instability in the Roman Empire known as the Year of the Five Emperors. After the assassination of Pertinax, Didius Julianus briefly claimed the throne, and civil war followed, with several claimants—Pescennius Niger, Clodius Albinus, and Septimius Severus—ultimately leading to Severus becoming the sole ruler.

In computing and information systems, leading zeros are commonly used to pad numbers to fixed widths. Therefore, 0193 may appear as a code, inventory number, or catalog entry in various datasets. In some programming languages, a leading zero signals octal notation, though digits such as 9 are not valid in octal, making 0193 invalid as an octal literal in those contexts.

Related topics include the number 193, the concept of leading zeros, and the historical year 193 CE.