155 (number)
155 is the natural number following 154 and preceding 156.
In mathematics
155 is:- a composite number
- a semiprime.
- a deficient number, since 1+5+31=37<155.
- odious, since its binary expansion has a total of 5 ones in it.
- Its prime factorization is 5*31, and the sum of the prime numbers between 5 and 31, inclusively, is 155.
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. Only three other "small" semiprimes share this attribute.
Other uses
- 155 is the airline code for DHL Aviation.