11010001 Binary to Octal

11010001 binary = 321 octal

11010001 written in octal is 321, the number 209 in everyday decimal.

From To 321

11010001 binary = 321 octal

How to convert 11010001 to octal

Because 8 = 2³, every octal digit stands for exactly 3 binary digits. Split the binary number into groups of 3 from the right (adding leading zeros), then write each group as one octal digit:

Binary group	Octal digit
`011`	`3`
`010`	`2`
`001`	`1`

Result: 11010001 in binary = 321 in octal.

11010001 (binary) in other systems

Decimal	`209`
Roman numerals	`CCIX`
Hexadecimal	`D1`
Duodecimal	`155`
Ternary	`21202`
Base 36	`5T`
Vigesimal	`A9`
Quaternary	`3101`
Quinary	`1314`
Senary	`545`

11010001 in all number systems →

Nearby binary to octal conversions

11001100 to octal	`314`
11001101 to octal	`315`
11001110 to octal	`316`
11001111 to octal	`317`
11010000 to octal	`320`
11010010 to octal	`322`
11010011 to octal	`323`
11010100 to octal	`324`
11010101 to octal	`325`
11010110 to octal	`326`

Binary to octal converter →

About the number 209

209 is an odd number.
209 is not a prime number.
Written in binary it needs 8 bits, so it fits in one byte.

Reverse conversion

Frequently asked questions

What is 11010001 in octal?

11010001 in binary is 321 in octal (the number 209 in decimal).