Factors of 155

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What are the factors of 155?

Answer

Factors of 155:

1, 5, 31, 155

4 factors · 155 = 5 × 31 · composite

Underlined — prime: 5, 31 · 1 — neither prime nor composite · others — composite

Factor pairs of 155

2 pairs: 1 × 155 · 5 × 31

Past √155 ≈ 12.45 every pair would repeat one already found — so checking stops at 12.

155 = 5 × 31 → (1 + 1) × (1 + 1) = 4 factors: add 1 to each exponent and multiply.

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See Also

Prime Number Checker - Find out whether a given number is Prime or not
Prime Factorization - Prime Factorization Calculator
Prime Numbers List - List of all Prime Numbers - how many Prime numbers are between

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Factors Table

Number	Factors
140	1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140
141	1, 3, 47, 141
142	1, 2, 71, 142
143	1, 11, 13, 143
144	1, 2, 3, 4, 6, 8, 9, 12, 16, 18, 24, 36, 48, 72, 144
145	1, 5, 29, 145
146	1, 2, 73, 146
147	1, 3, 7, 21, 49, 147
148	1, 2, 4, 37, 74, 148
149	1, 149
150	1, 2, 3, 5, 6, 10, 15, 25, 30, 50, 75, 150
151	1, 151
152	1, 2, 4, 8, 19, 38, 76, 152
153	1, 3, 9, 17, 51, 153
154	1, 2, 7, 11, 14, 22, 77, 154
155	1, 5, 31, 155
156	1, 2, 3, 4, 6, 12, 13, 26, 39, 52, 78, 156
157	1, 157
158	1, 2, 79, 158
159	1, 3, 53, 159
160	1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160
161	1, 7, 23, 161
162	1, 2, 3, 6, 9, 18, 27, 54, 81, 162
163	1, 163
164	1, 2, 4, 41, 82, 164
165	1, 3, 5, 11, 15, 33, 55, 165
166	1, 2, 83, 166
167	1, 167
168	1, 2, 3, 4, 6, 7, 8, 12, 14, 21, 24, 28, 42, 56, 84, 168
169	1, 13, 169

FAQ

What are the factors of 155?

Factors of 155: 1, 5, 31, 155

How many factors does 155 have?

Number 155 has 4 factors

How many factor pairs does 155 have?

Number 155 has 2 factor pairs

Is 155 a prime or composite number?

Composite: 155 = 5 × 31, so it has 4 factors — a prime has exactly two.

How many factors does 155 have excluding 1 and 155?

2: 5 and 31.