The number 31670
31670 is a composite number with 8 divisors. Its prime factorisation is 2 × 5 × 3167. Divisors (8): 1, 2, 5, 10, 3167, 6334, 15835, 31670.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
31670 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
31670 is composite. Its prime factorisation is
- 3
The divisors add up to 57024; without 31670 itself that is 25354, so 31670 is deficient (25354 is less than 31670). Euler's totient φ(31670) = 12664 numbers up to 31670 share no factor with it.
- 4
The digits of 31670 add up to 17, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 103 steps to reach 1.
LaTeX source of the formulas on this page
\[ 31670 = 2 \times 5 \times 3167 \]
31670 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 57024 |
| Euler totient φ(n) | 12664 |
| Square | 1002988900 |
| Cube | 31764658463000 |
| Square root | 177.960670 |
| Digit sum / digital root | 17 / 8 |
| Collatz steps to 1 | 103 |
| Scientific notation | 3.167 × |
31670 in other forms
| Form | Value |
|---|---|
| In words | thirty-one thousand six hundred and seventy |
| Binary (base 2) | 111101110110110 |
| Octal (base 8) | 75666 |
| Hexadecimal (base 16) | 7BB6 |
| Base 3 | 1121102222 |
| As time | 31670 seconds = 8 h 47 min 50 s |
Is 31670 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (31670 ÷ 2 = 15835) | 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 2) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | Yes (31670 ÷ 5 = 6334) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 2) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 2) | 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 6) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 8) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | Yes (31670 ÷ 10 = 3167) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 1) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 2) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 31670 a prime number?
No. 31670 = 2 × 5 × 3167, so it is divisible by 2.
What are the factors of 31670?
1, 2, 5, 10, 3167, 6334, 15835, 31670.
What is 31670 in binary?
111101110110110 (hexadecimal 7BB6, octal 75666).
What is the square root of 31670?
About 177.9607.
Is 31670 divisible by 3?
No. Its digits add up to 17, which is not a multiple of 3.
What is special about the number 31670?
It is a composite number with 8 divisors.