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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 | |||
Senary | 4156 | |||
Octal | 2338 | |||
Duodecimal | 10B12 | |||
Hexadecimal | 9B16 |
155 (one hundred [and] fifty-five) is the natural number following 154 and preceding 156.
155 is:
There are 155 primitive permutation groups of degree 81. OEIS: A000019
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: