133 (number)
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133 is a natural number that follows 132 and precedes 134. It is a composite number, meaning it has divisors other than 1 and itself.
The divisors of 133 are 1, 7, 19, and 133. Its prime factorization is therefore 7 × 19. As a number it is odd and not divisible by 2.
Mathematical properties
The sum of its proper divisors—1 + 7 + 19—equals 27, which is less than 133. Therefore 133 is a deficient number. It is also a three-digit number in base 10.
133 can be expressed in various ways in base 10. It is sometimes called a Harshad number in other bases; however in base 10, the sum of its digits is 1 + 3 + 3 = 7, and since 7 does not divide 133 evenly—133 ÷ 7 = 19—it is not actually a Harshad number in base 10.
Other numeral systems
In binary, 133 is written as 10000101. In hexadecimal it is 85. In Roman numerals it is written CXXXIII.