The number 2471
2471 is a composite number with 4 divisors. Its prime factorisation is 7 × 353. Divisors (4): 1, 7, 353, 2471.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 2471: a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 7 × 353, the product of two primes.
- 2
2471 is composite. Its prime factorisation is
- 3
The divisors add up to 2832; without 2471 itself that is 361, so 2471 is deficient (361 is less than 2471). Euler's totient φ(2471) = 2112 numbers up to 2471 share no factor with it.
- 4
The digits of 2471 add up to 14, and repeating that until one digit is left gives the digital root 5. The Collatz sequence (halve if even, else 3n+1) takes 133 steps to reach 1.
LaTeX source of the formulas on this page
\[ 2471 = 7 \times 353 \]
2471 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 2832 |
| Euler totient φ(n) | 2112 |
| Square | 6105841 |
| Cube | 15087533111 |
| Square root | 49.709154 |
| Digit sum / digital root | 14 / 5 |
| Collatz steps to 1 | 133 |
| Scientific notation | 2.471 × |
2471 in other forms
| Form | Value |
|---|---|
| In words | two thousand four hundred and seventy-one |
| Roman numerals | MMCDLXXI |
| Binary (base 2) | 100110100111 |
| Octal (base 8) | 4647 |
| Hexadecimal (base 16) | 9A7 |
| Base 3 | 10101112 |
| As time | 2471 seconds = 41 min 11 s |
Is 2471 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | No (remainder 1) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | No (remainder 2) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | No (remainder 3) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 1) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 5) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | Yes (2471 ÷ 7 = 353) | A number is divisible by 7 if double the last digit and subtract it from the rest: the result is a multiple of 7. |
| 8 | No (remainder 7) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 5) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 1) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 7) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 11) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 2471 a prime number?
No. 2471 = 7 × 353, so it is divisible by 7.
What are the factors of 2471?
1, 7, 353, 2471.
What is 2471 in binary?
100110100111 (hexadecimal 9A7, octal 4647).
What is the square root of 2471?
About 49.7092.
What is 2471 in Roman numerals?
MMCDLXXI.
Is 2471 divisible by 3?
No. Its digits add up to 14, which is not a multiple of 3.
What is special about the number 2471?
2471 is a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 7 × 353, the product of two primes.