What is the binary number 1011011 in decimal?

The binary number 1011011 is the decimal number 91.

The digits in a binary number are exponents of 2 rather than 10, so that for a seven-digit number in binary, the digit places represent

64, 32, 16, 8, 4, 2, 1 instead of increasing values of 10.

1011011 = 64 + (0x32) +16 + 8 + (0x4) + 2 + 1 = 91