155 (number)

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Cardinal One hundred [and]
fifty-five
Ordinal 155th
Factorization 5 \cdot 31
Divisors 1, 5, 31, 155
Roman numeral CLV
Binary 10011011
Hexadecimal 9B

155 (one hundred fifty-five or one hundred and fifty-five) is the natural number following 154 and preceding 156. It is a composite number.

If you add up all the primes between the least and greatest prime factors of 155, that is, 5 and 31, the result is 155. (sequence A055233 in OEIS)

There are 155 primitive permutations of degree 81. OEISA000019

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