2019
2019 is the year the first image of a black hole was published.
- Odd
- Composite
Where 2019 fits
Why 2019 is special
Eight radio telescopes were combined into an Earth-sized virtual instrument, producing so much data it was shipped physically on hard drives rather than transmitted. The result confirmed predictions made a century earlier.
2019 is part of
Factors & digit properties
- Divisors (4)
- 1, 3, 673, 2019
- Prime factorisation
- 3 × 673
- Digit sum
- 12
- Digital root
- 3
Representations
- Decimal
- 2019
- Binary
- 11111100011
- Octal
- 3743
- Hexadecimal
- 7e3
- Roman numeral
- MMXIX
- Scientific notation
- 2.019 × 10^3
Other mathematical patterns
- Deficient number
- Happy number
- Semiprime
- Lucky number (mathematical sieve)
Related numbers & connections
A comet panic built on a real detection, and a black hole image built on data too large to transmit. Both show a true technical detail reaching the public in a form its discoverers did not choose.
View 1910 →Science
Eight radio telescopes were combined into an Earth-sized virtual instrument to image a black hole. The volume of data was too large to transmit, so it was flown on physical drives. The result matched predictions made a century earlier.
DocumentedSciencePeriod: April 2019
Common questions
Is 2019 a prime number?
No, 2019 is not prime.
What are the factors of 2019?
The factors of 2019 are 1, 3, 673, 2019.
What is 2019 in Roman numerals?
2019 in Roman numerals is MMXIX.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 1 reviewer-confirmed record, sourced and reviewed before publication.
Last reviewed: 3 August 2026