31999

31999 is a natural number that follows 31998 and precedes 32000. It is an odd, composite number with prime factorization 11 × 2909. The sum of its digits is 31, so it is not divisible by 3 or 9. It is also one less than 32000.

In astronomy, 31999 is used as the permanent number for a minor planet in the catalog of small Solar System bodies maintained by the Minor Planet Center. Each numbered minor planet is assigned a number once its orbit is well determined, and many receive a name later. In this context, the object is typically written as (31999) [Name], with the name optional if it has not been officially assigned.

Beyond mathematics and astronomy, five-digit numbers like 31999 can appear as identifiers in various catalogs, databases, or documentation. Its specific meaning depends on the surrounding context, as with many numeric codes used across different fields.