The Natural Number 2

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Properties of the Number 2

• Because 2 is divisible by 2 ...
• 2 is an even number
• 2 has parity 0
• 2 is not an odd number

• Because 2 has only 1 and itself as divisors ...
• 2 is a prime number
• 2 is not a composite number

Alternative Representations of the Number 2

• Base 2 (binary): 10
• Base 8 (octal): 2
• Base 16 (hexadecimal): 2

• Roman numeral: II

• Words: two

Divisors of the Number 2

• 2 has 2 positive divisors: 1, 2
• The sum of the positive divisors is 3
• 2 has 1 proper divisor: 1
• The sum of the proper divisors is 1

• 2 is a deficient number since the sum of the proper divisors is less than 2
• 2 is not a perfect number
• 2 is not an abundant number

More Properties of the Number 2

• 2 is not a square number
• 2 is not a cube number

• 2 is a palindromic number (i.e., the digits are the same forwards and backwards)

• 2 is a Fibonacci number
• 2 is a Lucas number