138161

138161 is an integer in the natural numbers. It is odd and can be expressed as the product 23 × 6007, which confirms that it is a composite number. In decimal notation its digits are 1, 3, 8, 1, 6, 1. In hexadecimal, it is 0x21BB1. The sum of its digits is 20, so it is not divisible by 3, and it ends in 1, so it is not divisible by 5. Its prime factors include 23, and the remaining factor is 6007.

In mathematics, 138161 may be encountered in various number theoretic contexts, such as factorization exercises or modular arithmetic. Its simple factorization makes it a straightforward example for demonstrating how composite numbers can be represented as a product of integers greater than 1.

In astronomy, 138161 is also used as the numerical designation for a numbered minor planet. The Minor Planet Center assigns numbers to small Solar System bodies after their orbits are sufficiently well determined. The object may later be given a name by its discoverers and approved by the International Astronomical Union. Until named, it is typically written as (138161). The use of numerical designations reflects a systematic cataloging approach that distinguishes objects beyond the initial provisional designations.

Overall, 138161 serves as both a concrete integer with a known factorization and a catalog identifier within the scientific practice of classifying minor planets.