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Factors of 991

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What are the Factors of 991?

Answer

Factors of 991:

1, 991

2 factors — 1 and 991 · prime number

Underlined — prime: 991 · 1 — neither prime nor composite

Factor pairs of 991

1 pair: 1 × 991

Up to √991 ≈ 31.48 no number from 2 to 31 divides 991 — there are no other pairs.

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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 of 991. Factors of 991: full list and factor pairs.

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Factors Table

Number	Factors
976	1, 2, 4, 8, 16, 61, 122, 244, 488, 976
977	1, 977
978	1, 2, 3, 6, 163, 326, 489, 978
979	1, 11, 89, 979
980	1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 98, 140, 196, 245, 490, 980
981	1, 3, 9, 109, 327, 981
982	1, 2, 491, 982
983	1, 983
984	1, 2, 3, 4, 6, 8, 12, 24, 41, 82, 123, 164, 246, 328, 492, 984
985	1, 5, 197, 985
986	1, 2, 17, 29, 34, 58, 493, 986
987	1, 3, 7, 21, 47, 141, 329, 987
988	1, 2, 4, 13, 19, 26, 38, 52, 76, 247, 494, 988
989	1, 23, 43, 989
990	1, 2, 3, 5, 6, 9, 10, 11, 15, 18, 22, 30, 33, 45, 55, 66, 90, 99, 110, 165, 198, 330, 495, 990
991	1, 991
992	1, 2, 4, 8, 16, 31, 32, 62, 124, 248, 496, 992
993	1, 3, 331, 993
994	1, 2, 7, 14, 71, 142, 497, 994
995	1, 5, 199, 995
996	1, 2, 3, 4, 6, 12, 83, 166, 249, 332, 498, 996
997	1, 997
998	1, 2, 499, 998
999	1, 3, 9, 27, 37, 111, 333, 999
1,000	1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 125, 200, 250, 500, 1000
1,001	1, 7, 11, 13, 77, 91, 143, 1001
1,005	1, 3, 5, 15, 67, 201, 335, 1005
1,008	1, 2, 3, 4, 6, 7, 8, 9, 12, 14, 16, 18, 21, 24, 28, 36, 42, 48, 56, 63, 72, 84, 112, 126, 144, 168, 252, 336, 504, 1008
1,010	1, 2, 5, 10, 101, 202, 505, 1010
1,015	1, 5, 7, 29, 35, 145, 203, 1015

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FAQ

What are the Factors of 991?

Factors of 991: 1, 991

How many factors does 991 have?

Number 991 has 2 factors

How many Factor Pairs does 991 have?

Number 991 has 1 factor pair

Is 991 a prime or composite number?

Prime: its only factors are 1 and 991 — no prime up to √991 ≈ 31.48 divides it.