16561

The number 16561 is a composite number. Its prime factorization is 13 multiplied by 1273. It is not a perfect square, nor is it a perfect cube. In binary, 16561 is represented as 100000010010001. In hexadecimal, it is written as 4091.

The sequence of numbers containing 16561 is diverse. For instance, it is the 16561st term in the sequence of prime numbers, although this is simply by definition of its ordinal position rather than a mathematical property. It is also a member of the A000040 sequence in the On-Line Encyclopedia of Integer Sequences (OEIS), which lists all prime numbers. Another sequence it appears in is A000225, which consists of numbers of the form 2^n - 1, though 16561 is not itself a Mersenne number.

In certain contexts, 16561 might refer to a specific identifier. For example, it could be a postal code, a product model number, or part of a larger alphanumeric code used in various industries or systems. Without further context, it is difficult to pinpoint a singular, universally recognized meaning beyond its mathematical properties as an integer.