The number 31415
31415 is a composite number with 8 divisors. Its prime factorisation is 5 × 61 × 103. Divisors (8): 1, 5, 61, 103, 305, 515, 6283, 31415.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
31415 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
31415 is composite. Its prime factorisation is
- 3
The divisors add up to 38688; without 31415 itself that is 7273, so 31415 is deficient (7273 is less than 31415). Euler's totient φ(31415) = 24480 numbers up to 31415 share no factor with it.
- 4
The digits of 31415 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 85 steps to reach 1.
LaTeX source of the formulas on this page
\[ 31415 = 5 \times 61 \times 103 \]
31415 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 38688 |
| Euler totient φ(n) | 24480 |
| Square | 986902225 |
| Cube | 31003533398375 |
| Square root | 177.242771 |
| Digit sum / digital root | 14 / 5 |
| Collatz steps to 1 | 85 |
| Scientific notation | 3.1415 × |
31415 in other forms
| Form | Value |
|---|---|
| In words | thirty-one thousand four hundred and fifteen |
| Binary (base 2) | 111101010110111 |
| Octal (base 8) | 75267 |
| Hexadecimal (base 16) | 7AB7 |
| Base 3 | 1121002112 |
| As time | 31415 seconds = 8 h 43 min 35 s |
Is 31415 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 | Yes (31415 ÷ 5 = 6283) | 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 | No (remainder 6) | 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 5) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 10) | 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 31415 a prime number?
No. 31415 = 5 × 61 × 103, so it is divisible by 5.
What are the factors of 31415?
1, 5, 61, 103, 305, 515, 6283, 31415.
What is 31415 in binary?
111101010110111 (hexadecimal 7AB7, octal 75267).
What is the square root of 31415?
About 177.2428.
Is 31415 divisible by 3?
No. Its digits add up to 14, which is not a multiple of 3.
What is special about the number 31415?
It is a composite number with 8 divisors.