18001881

18001881 is a twelve‑digit integer used as a numeric identifier in several public databases and archival systems. In its decimal representation it is written exactly as 18001881. The number is even, with a sum of its digits equal to 27, which makes it divisible by 3. In fact, 18001881 = 3^2 × 2000209, where the factor 2000209 is itself a prime number. The integer is greater than 10^6 and less than 10^7, placing it in the range of typical product codes or accession numbers assigned to items in catalogues such as libraries, museums, and logistics systems.

In binary format the number occupies 24 bits, starting with a leading 1 followed by a pattern of 0s and 1s that reflects its exact value (the binary representation is 1000101101100101000101). In hexadecimal form it is written as 0x1148B0909. Because it does not correspond to any known historical year or widely referenced code, its primary significance comes from its role as a unique document or object identifier.

See also: Numeric identifier, Identifier in digital libraries, 18001881 (identifier).