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991 is a prime number from 901-1000. 991 has 2 factors, 1 and 991. It is the 167th prime number, and the thirteenth prime number from 901-1000.

ProofsEdit

  • Yes — 991 can be divided by 1.
  • No — 991 cannot be divided by 2-990.
  • Yes — 991 can be divided by 991.

Relationship with other odd numbersEdit

The numbers beforeEdit

  • The previous prime number is 983, 8 numbers away.
    • 987 is the product of 3, 7, and 47.
    • 989 is the product of 23 and 43.

The numbers afterEdit

  • The next prime number is 997.
    • 991 and 997 are sexy primes.
  • 1,009 is the next prime number after 997. The gap between the two numbers is 12.
    • 1,001 is divisible by 7, 1,003 by 17, and 1,007 by 19.

TriviaEdit

  • 991, 99991, and 9999991 are all prime.
  • This number, 331 and 661 are all prime. Note that the product of these three primes is a Carmichael Number.
  • The largest three-digit permutable prime.
  • 991^2 = 982081 and 982 + 0 + 8 + 1 = 991.
  • Florida angler Allen Ogle caught a 991-pound Hammerhead Shark on May 30, 1982.

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