155 (number)

155 (one hundred fifty-five) is a natural number. It comes after 154 and before 156.

In mathematics

• 155 is a semiprime number. This means it is the product of two prime numbers. Its prime factorization is:

155=5×31

• In Roman numerals, 155 is written as CLV.

Other facts

• 155 is the police emergency telephone number in Turkey.
• The year AD 155 was a year in the Julian calendar (used in ancient Rome). It was the year after AD 154 and before AD 156.