825

825 is a natural number that follows 824 and precedes 826. It is an odd composite number.

Its prime factorization is 3 × 5^2 × 11, and its positive divisors are 1, 3, 5, 11, 15, 25, 33, 55, 75, 165, 275, and 825.

In Roman numerals it is written as DCCCXXV.

In other bases, 825 equals 1100111001 in binary, 1471 in octal, and 0x339 in hexadecimal.

The number also appears in calendar contexts as the year 825 CE in the early medieval period.

In North America, 825 is an area code used in Alberta, Canada. In jewelry, 825 denotes fineness of 82.5% gold, a common marking for gold alloys.