The Natural Number 991

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Properties of the Number 991

  • Because 991 is not divisible by 2 ...
    • 991 is an odd number
    • 991 has parity 1
    • 991 is not an even number
  • Because 991 has only 1 and itself as divisors ...
    • 991 is a prime number
    • 991 is not a composite number

Alternative Representations of the Number 991

  • Base 2 (binary): 1111011111
  • Base 8 (octal): 1737
  • Base 16 (hexadecimal): 3DF
  • Roman numeral: CMXCI
  • Words: nine hundred ninety-one

Divisors of the Number 991

  • 991 has 2 positive divisors: 1, 991
    • The sum of the positive divisors is 992
  • 991 has 1 proper divisor: 1
    • The sum of the proper divisors is 1
  • 991 is a deficient number since the sum of the proper divisors is less than 991
  • 991 is not a perfect number
  • 991 is not an abundant number

More Properties of the Number 991

  • 991 is not a square number
  • 991 is not a cube number
  • 991 is not a palindromic number
  • 991 is not a Fibonacci number
  • 991 is not a Lucas number

12:05 pm, Friday, March 24, 2017 (UTC; +0000)
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