Prime Factorization of 81

"Prime Factorization" Calculator

What is the Prime Factorization of 81?

Answer

Prime Factors of 81:

3, 3, 3, 3

81 = 3⁴ · composite · 5 factors · 4 prime factors counting repeats

Division ladder

81	3
27	3
9	3
3	3
1

Left: what is left; right: the smallest prime that divides it; 1 at the bottom.

Second way — factor tree

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See Also

Factors of a Number - List all Factors and Factor Pairs of a Number
Prime Number Checker - Find out whether a given number is Prime or not
Prime Numbers List - List of all Prime Numbers - how many Prime numbers are between

Recalculate with different values ↑

Prime Factorization Table

Number	Prime Factors
66	2, 3, 11
67	67
68	2² × 17
69	3, 23
70	2, 5, 7
71	71
72	2³ × 3²
73	73
74	2, 37
75	3 × 5²
76	2² × 19
77	7, 11
78	2, 3, 13
79	79
80	2⁴ × 5
81	3⁴
82	2, 41
83	83
84	2² × 3 × 7
85	5, 17
86	2, 43
87	3, 29
88	2³ × 11
89	89
90	2 × 3² × 5
91	7, 13
92	2² × 23
93	3, 31
94	2, 47
95	5, 19

FAQ

What is the Prime Factorization of 81?

Prime Factors of 81: 3, 3, 3, 3

How many prime factors does 81 have?

Number 81 has 4 prime factors counting repeats; 1 different: 3.

What is the Prime Factorization of 81 in exponential form?

The Prime Factorization of the number 81 in the exponential form is: 3⁴