The Natural Number 13

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Properties of the Number 13

• Because 13 is not divisible by 2 ...
• 13 is an odd number
• 13 has parity 1
• 13 is not an even number

• Because 13 has only 1 and itself as divisors ...
• 13 is a prime number
• 13 is not a composite number

Alternative Representations of the Number 13

• Base 2 (binary): 1101
• Base 8 (octal): 15
• Base 16 (hexadecimal): D

• Roman numeral: XIII

• Words: thirteen

Divisors of the Number 13

• 13 has 2 positive divisors: 1, 13
• The sum of the positive divisors is 14
• 13 has 1 proper divisor: 1
• The sum of the proper divisors is 1

• 13 is a deficient number since the sum of the proper divisors is less than 13
• 13 is not a perfect number
• 13 is not an abundant number

More Properties of the Number 13

• 13 is not a square number
• 13 is not a cube number

• 13 is not a palindromic number

• 13 is a Fibonacci number
• 13 is not a Lucas number