The number 91

Representation numerals

Greek numeral

ϟαʹ

Arabic numeral

٩١

Roman numeral

XCI

Maya numeral

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Chinese numeral

九十一

Hebrew numeral

צא
Numeral systems
Binary: 1011011
Septimal (base 7): 160
Octal: 133
Hexadecimal: 5b
Base 24: 3J
Factorization
91 = 7 × 13
91 has 4 divisors: 1, 7, 13, 91
Sum of all divisors other than 91: 21
Sums & differences
Difference of 2 squares: 91 = 102 - 32 = 462 - 452
Characteristics
91 is a triangular number

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The next triangular is: 105
91 is a hexagonal number
Related primes
The 91th prime number is: 467
Previous prime number: 89 — Next prime number: 97
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