315

315 is a natural number that follows 314 and precedes 316. In mathematics, it is an odd composite number with prime factorization 3^2 × 5 × 7. It is divisible by 3, 5, and 7, as well as by 9 and 15, and it is a Harshad number in base 10 because the sum of its digits is 3 + 1 + 5 = 9 and 315 ÷ 9 = 35.

In different numeral systems, 315 is written as CCCXV in Roman numerals, 100111011 in binary, and 0x13B in hexadecimal.

In calendrical usage, 3/15 denotes March 15, the Ides of March, a date historically associated with the assassination of Julius Caesar. The reference is commonly cited in discussions of Roman history and literature.

315 is also used as a telephone area code for central New York, including the city of Syracuse and surrounding areas. It is part of the North American Numbering Plan and is associated with several local communities in that region.