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# 155 (number)

 ← 154 155 156 →
Cardinalone hundred fifty-five
Ordinal155th
(one hundred fifty-fifth)
Factorization5 × 31
Divisors1, 5, 31, 155
Greek numeralΡΝΕ´
Roman numeralCLV
Binary100110112
Ternary122023
Quaternary21234
Quinary11105
Senary4156
Octal2338
Duodecimal10B12
Vigesimal7F20
Base 364B36

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

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• ✪ ANGEL NUMBER 155 - (Meanings & Symbolism) - ANGEL NUMBERS

## In mathematics

155 is:

There are 155 primitive permutation groups of degree 81.

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.

155 is also: