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# 133 (number)

 ← 132 133 134 →
Cardinalone hundred thirty-three
Ordinal133rd
(one hundred thirty-third)
Factorization7 × 19
Divisors1, 7, 19, 133
Greek numeralΡΛΓ´
Roman numeralCXXXIII
Binary100001012
Ternary112213
Quaternary20114
Quinary10135
Senary3416
Octal2058
DuodecimalB112
Vigesimal6D20
Base 363P36

133 (one hundred [and] thirty-three) is the natural number following 132 and preceding 134.

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## In mathematics

133 is an n whose divisors (excluding n itself) added up divide φ(n). It is an octagonal number[1] and a Harshad number.[2] It is also a happy number.[3]

133 is a repdigit in base 11 (111) and base 18 (77), whilst in base 20 it is a cyclic number formed from the reciprocal of the number three.

133 is a semiprime: a product of two prime numbers, namely 7 and 19. Since those prime factors are Gaussian primes, this means that 133 is a Blum integer.

133 is also: