1971
1971 is the year the first microprocessor and the first email were released.
- Odd
- Composite
Where 1971 fits
Why 1971 is special
Intel's 4004 shipped and Ray Tomlinson sent the first network email, choosing the @ sign because it was the only preposition on the keyboard. Britain also decimalised its currency that February.
Factors & digit properties
- Divisors (8)
- 1, 3, 9, 27, 73, 219, 657, 1971
- Prime factorisation
- 3^3 × 73
- Digit sum
- 18
- Digital root
- 9
Representations
- Decimal
- 1971
- Binary
- 11110110011
- Octal
- 3663
- Hexadecimal
- 7b3
- Roman numeral
- MCMLXXI
- Scientific notation
- 1.971 × 10^3
Other mathematical patterns
- Deficient number
Related numbers & connections
The term is traced to a group of California students meeting at 4:20 in about 1971.
View 420 →Technology & computing
Ray Tomlinson picked @ for network email because it was the only preposition on the keyboard and appeared in no one's name. Intel's 4004 shipped the same year, and Britain decimalised its currency that February.
DocumentedTechnology & computingPeriod: 1971
Common questions
Is 1971 a prime number?
No, 1971 is not prime.
What are the factors of 1971?
The factors of 1971 are 1, 3, 9, 27, 73, 219, 657, 1971.
What is 1971 in Roman numerals?
1971 in Roman numerals is MCMLXXI.
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