The Number
1991
One Thousand Nine Hundred and Ninety-One
In Base 2 Binary Is
111110001112
The numbers with a 2 subscript use Base 2 Binary notation.
For more familiar numbers: See One Thousand Nine Hundred and Ninety-One in Base 10 Decimal
Nearby Numbers
Positive, nonzero integers within three units
Scientific Notation
Scientific notation expresses a quantity as the product of its significand with 10 raised to an integer exponent.
1.991e3
Reciprocal
A number multiplied with its reciprocal is one.
0.0000000000100000111010101000011100000001111011011011110111101012
The reciprocal of 1991 in Base 2 Binary.
Palindrome?
A numerical palindrome has the same value when all of its digits are reversed.
The number 111110001112 is not a palindrome.
Not A Prime Number
A prime number is a positive integer that is divisible only by itself and one.
One thousand nine hundred and ninety-one is a composite number with 4 total factors (including 1 and itself). See primes in Base 2 Binary
A Composite
Composites have more than just these two factors.
One thousand nine hundred and ninety-one is a composite number with 4 total factors (including 1 and itself).
Prime Factors
The number one thousand nine hundred and ninety-one has the following 2 prime factors:
Prime Factorization
The prime factorization of a positive integer is the unique list of prime factors together with their multiplicities
101121
·
1011010121
= 111110001112
Base Conversions
The number one thousand nine hundred and ninety-one in 35 different bases