1019

1019 is a prime number in the decimal system. It lies between 1018 and 1020 and is an odd integer. It is congruent to 3 modulo 4, meaning it leaves a remainder of 3 when divided by 4. In Roman numerals, 1019 is written MXIX.

As a year, 1019 CE falls in the 11th century. During this year, the Byzantine Empire was ruled by Basil II, and the Song dynasty in China was under Emperor Zhenzong, reflecting concurrent medieval developments across Europe and Asia.

In mathematical terms, 1019 being a prime number characterizes its divisibility properties: it has no divisors other than 1 and itself, which influences its use in number theory and cryptography discussions that involve prime numbers and modular arithmetic.