Representation numerals

ϟθʹ

٩٩

XCIX

●●●●

●●●●

▃▃▃▃▃

▃▃▃▃▃

▃▃▃▃▃

▃▃▃▃▃

▃▃▃▃▃

▃▃▃▃▃

九十九

צט

Numeral systems

Binary: 1100011

Septimal (base 7): 201

Octal: 143

Hexadecimal: 63

Base 24: 43

Factorization

99 = 3 × 3 × 11

99 has 6 divisors: 1, 3, 9, 11, 33, 99

Sum of all divisors other than 99: 57

Sums & differences

Difference of 2 squares: 99 = 18^{2} - 15^{2} = 50^{2} - 49^{2}

Characteristics

99 is a palindromic number in decimal system

99 is a palindromic number in binary system (1100011)