Number 81

Representations of 81
Greek numeral
παʹ
Arabic numeral
٨١
Roman numeral
LXXXI
Maya numeral
●●●●
●
Chinese numeral
八十一
Hebrew numeral
פא
81 in different numeral systems
Binary
1010001
Base-3
10000
Base-4
1101
Base-5
311
Base-6
213
Base-7
144
Base-8
121
Duodecimal
69
Hex
51
Vigesimal
41
Base-24
39
Base-36
29
Negabinary
1010001
Factorization
Prime factors
3
Divisors
1, 3, 9, 27, 81
Sum of divisors other than 81
40
Product of prime factors
81 = 3 x 3 x 3 x 3
Characteristics
Heptagonal Square Fourth Power Perfect Power Difference of 2 squares Harshad Odd Composite Deficient
Related primes
Number 81 prime
419
Prime number before 81
79
Prime number after 81
83