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91 (number)

来源：萌宠菠菠乐园时间：2026-02-19 10:34

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91 (number)

91 is a natural integer number, after 90 and before 92. It is ninety-one in English form.

< 90 | 92 >

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99

Factorization[]

91 is equal to 7 x 13 or 13 x 7.

Proof:

91 does not end with a 2, 4, 6, 8, or 0, so it's not divisible by two.

It is not divisible by 3, because 9+1 = 10, 1+0=1, and 1 is not a multiple of 3

91 does not end with 5 or 0, so it is not divisible by 5.

91/7 equals to 13, so it is divisible by 7.

Properties[]

It is the 27th semiprime (a number added by two primes).

A triangular number: 13th number, equals to 1+2+3+4+......+10+11+12+13.

A hexagonal number: After 66 and before 120.

It's the smallest number presented as six continued squares: 12 + 22 +...... +62

It is centered cube number.

Uses[]

91 is the number international call of India.

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