10010001

10010001 is an 8-bit binary numeral. In binary, digits from most significant to least are 1 0 0 1 0 0 0 1. As a hexadecimal value it is 0x91 and as a decimal value it is 145.

Interpreted as an unsigned integer, 10010001 equals 145. Interpreted as an eight-bit signed value using two's complement, it represents -111.

In character encoding, 0x91 is not a standard printable ASCII character. In Windows-1252, the byte 0x91 maps to the left single quotation mark. In ISO/IEC 8859-1, 0x91 is a control code and typically not printed. In UTF-8, the byte 0x91 by itself is invalid; it would appear only as part of a multi-byte sequence.

The bit pattern has three set bits (bit weights 128, 16, 1), giving a bit count of 3. The prime factorization of 145 is 5 × 29. The value is the sum of powers of two: 128 + 16 + 1.

In computing contexts, 10010001 can serve as a test byte or a placeholder bit pattern for demonstrations of bitwise operations, masking, or data transmission tests. Some systems may use values with the most significant bit set to indicate extended or signed data.