Factors of 561

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What are the Factors of 561?

Answer

Factors of 561:

1, 3, 11, 17, 33, 51, 187, 561

8 factors · 561 = 3 × 11 × 17 · composite

Underlined — prime: 3, 11, 17 · 1 — neither prime nor composite · others — composite

Factor pairs of 561

4 pairs: 1 × 561 · 3 × 187 · 11 × 51 · 17 × 33

Past √561 ≈ 23.69 every pair would repeat one already found — so checking stops at 23.

561 = 3 × 11 × 17 → (1 + 1) × (1 + 1) × (1 + 1) = 8 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
546	1, 2, 3, 6, 7, 13, 14, 21, 26, 39, 42, 78, 91, 182, 273, 546
547	1, 547
548	1, 2, 4, 137, 274, 548
549	1, 3, 9, 61, 183, 549
550	1, 2, 5, 10, 11, 22, 25, 50, 55, 110, 275, 550
551	1, 19, 29, 551
552	1, 2, 3, 4, 6, 8, 12, 23, 24, 46, 69, 92, 138, 184, 276, 552
553	1, 7, 79, 553
554	1, 2, 277, 554
555	1, 3, 5, 15, 37, 111, 185, 555
556	1, 2, 4, 139, 278, 556
557	1, 557
558	1, 2, 3, 6, 9, 18, 31, 62, 93, 186, 279, 558
559	1, 13, 43, 559
560	1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 56, 70, 80, 112, 140, 280, 560
561	1, 3, 11, 17, 33, 51, 187, 561
562	1, 2, 281, 562
563	1, 563
564	1, 2, 3, 4, 6, 12, 47, 94, 141, 188, 282, 564
565	1, 5, 113, 565
566	1, 2, 283, 566
567	1, 3, 7, 9, 21, 27, 63, 81, 189, 567
568	1, 2, 4, 8, 71, 142, 284, 568
569	1, 569
570	1, 2, 3, 5, 6, 10, 15, 19, 30, 38, 57, 95, 114, 190, 285, 570
571	1, 571
572	1, 2, 4, 11, 13, 22, 26, 44, 52, 143, 286, 572
573	1, 3, 191, 573
574	1, 2, 7, 14, 41, 82, 287, 574
575	1, 5, 23, 25, 115, 575

FAQ

What are the Factors of 561?

Factors of 561: 1, 3, 11, 17, 33, 51, 187, 561

How many factors does 561 have?

Number 561 has 8 factors

How many Factor Pairs does 561 have?

Number 561 has 4 factor pairs

Is 561 a prime or composite number?

Composite: 561 = 3 × 11 × 17, so it has 8 factors — a prime has exactly two.

How many factors does 561 have excluding 1 and 561?

6: 3, 11, 17, 33, 51 and 187.