155 (number)

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← 154 155 156 →
Cardinal one hundred fifty-five
Ordinal 155th
(one hundred fifty-fifth)
Factorization 5 × 31
Divisors 1, 5, 31, 155
Greek numeral ΡΝΕ´
Roman numeral CLV
Binary 100110112
Ternary 122023
Quaternary 21234
Quinary 11105
Senary 4156
Octal 2338
Duodecimal 10B12
Hexadecimal 9B16
Vigesimal 7F20
Base 36 4B36

155 (one hundred [and] fifty-five) is the natural number following 154 and preceding 156.

In mathematics[edit]

155 is:

There are 155 primitive permutation groups of degree 81. OEISA000019

If one adds up all the primes from the least through the greatest prime factors of 155, that is, 5 and 31, the result is 155. (sequence A055233 in the OEIS) Only three other "small" semiprimes (10, 39, and 371) share this attribute.

In the military[edit]

In sports[edit]

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In other fields[edit]

155 is also:

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