Factors of 261

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What are the Factors of 261?

Answer

Factors of 261:

1, 3, 9, 29, 87, 261

6 factors · 261 = 3² × 29 · composite

Underlined — prime: 3, 29 · 1 — neither prime nor composite · others — composite

Factor pairs of 261

3 pairs: 1 × 261 · 3 × 87 · 9 × 29

Past √261 ≈ 16.16 every pair would repeat one already found — so checking stops at 16.

261 = 3² × 29 → (2 + 1) × (1 + 1) = 6 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
246	1, 2, 3, 6, 41, 82, 123, 246
247	1, 13, 19, 247
248	1, 2, 4, 8, 31, 62, 124, 248
249	1, 3, 83, 249
250	1, 2, 5, 10, 25, 50, 125, 250
251	1, 251
252	1, 2, 3, 4, 6, 7, 9, 12, 14, 18, 21, 28, 36, 42, 63, 84, 126, 252
253	1, 11, 23, 253
254	1, 2, 127, 254
255	1, 3, 5, 15, 17, 51, 85, 255
256	1, 2, 4, 8, 16, 32, 64, 128, 256
257	1, 257
258	1, 2, 3, 6, 43, 86, 129, 258
259	1, 7, 37, 259
260	1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260
261	1, 3, 9, 29, 87, 261
262	1, 2, 131, 262
263	1, 263
264	1, 2, 3, 4, 6, 8, 11, 12, 22, 24, 33, 44, 66, 88, 132, 264
265	1, 5, 53, 265
266	1, 2, 7, 14, 19, 38, 133, 266
267	1, 3, 89, 267
268	1, 2, 4, 67, 134, 268
269	1, 269
270	1, 2, 3, 5, 6, 9, 10, 15, 18, 27, 30, 45, 54, 90, 135, 270
271	1, 271
272	1, 2, 4, 8, 16, 17, 34, 68, 136, 272
273	1, 3, 7, 13, 21, 39, 91, 273
274	1, 2, 137, 274
275	1, 5, 11, 25, 55, 275

FAQ

What are the Factors of 261?

Factors of 261: 1, 3, 9, 29, 87, 261

How many factors does 261 have?

Number 261 has 6 factors

How many Factor Pairs does 261 have?

Number 261 has 3 factor pairs

Is 261 a prime or composite number?

Composite: 261 = 3² × 29, so it has 6 factors — a prime has exactly two.

How many factors does 261 have excluding 1 and 261?

4: 3, 9, 29 and 87.