0o13131

0o13131 is a numeral written in octal notation, using the 0o prefix common in several programming languages to indicate base-8. The digits used are valid in octal (0–7), and the sequence 1-3-1-3-1 corresponds to the octal value.

In decimal, this value equals 5721. In binary, it is 1011001011001. In hexadecimal, it is 0x1659.

In programming contexts, octal literals are used for various low-level representations such as bit masks, permissions, and other settings where a base-8 grouping aligns with binary data. The 0o prefix distinguishes octal literals from decimal literals in languages like Python 3, where an expression such as 0o13131 is interpreted as the octal number 13131, equivalent to 5721 in decimal. Historically, octal notation has been prominent in Unix file permissions and other system-level configurations, though its use as a general numeric format varies by language.

There is no particular significance to the specific octal number 13131 beyond illustrating how an octal literal encodes a decimal value. As with other octal literals, 0o13131 demonstrates the mapping between base-8 representation and its base-10 and base-16 counterparts, as well as how such literals are parsed in modern programming languages.