3581

3581 is a natural number that comes after 3580 and before 3582. In mathematics, it is a prime number.

3581 is odd, and the sum of its digits is 17. As a prime, its only positive divisors are 1 and itself. In hexadecimal, 3581 is 0xDFD; in binary, 110111111101; and in Roman numerals it is MMMDLXXXI.

In astronomy, 3581 is the designation of a minor planet in the catalog of the Minor Planet Center. Each minor planet receives a sequential number once its orbit is confirmed, and some acquire names; 3581 corresponds to one such object, believed to lie in the main asteroid belt.