10001

10001 is the five-digit decimal integer 10,001. In mathematics, it can be expressed as 10^4 + 1 and factors as 73 × 137, making it a semiprime (the product of two distinct primes). It is a palindrome in base 10, reading the same forward and backward.

In other bases, representations differ. For example, the decimal value 10001 is 10011100010001₂ in binary. The palindromic property is specific to the base in which it is written and does not generally hold in other bases.

In postal addressing, 10001 is a ZIP code in New York City, covering portions of Manhattan in neighborhoods such as Chelsea and the Flatiron District. ZIP code boundaries and designations can change over time with urban development and administrative adjustments.

Unicode also uses the number 10001 as a code point: U+10001 is a character in the Linear B Syllabary block. This places 10001 within the range of early historic script characters encoded in the Unicode standard, illustrating how decimal numbers can appear as distinct identifiers in different systems.