The Number
643
Six Hundred and Forty-Three
In Base 2 Binary Is
10100000112
The numbers with a 2 subscript use Base 2 Binary notation.
For more familiar numbers: See Six Hundred and Forty-Three 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.
6.43e2
Reciprocal
A number multiplied with its reciprocal is one.
0.00000000011001011110110000010111111000110101010110011001010012
The reciprocal of 643 in Base 2 Binary.
Palindrome?
A numerical palindrome has the same value when all of its digits are reversed.
The number 10100000112 is not a palindrome.
A Prime Number
A prime number is a positive integer that is divisible only by itself and one.
Six hundred and forty-three is the 117th prime number. See primes in Base 2 Binary
Not A Composite
Composites have more than just these two factors.
Six Hundred and Forty-Three is not a composite number because it has exactly two factors: One and Six Hundred and Forty-Three
Prime Factors
The number six hundred and forty-three has the following 1 prime factor:
Prime Factorization
The prime factorization of a positive integer is the unique list of prime factors together with their multiplicities
101000001121
= 10100000112
Base Conversions
The number six hundred and forty-three in 35 different bases