The octal equivalent of a binary number 1011101011 is:

To find the octal equivalent of binary 1011101011, group the bits into sets of three starting from the right. Add leading zeros if necessary to complete the leftmost group: 001 011 101 011. Convert each triplet to octal: 001=1, 011=3, 101=5, 011=3. The result is 1353.