The number 31447
31447 is a composite number with 8 divisors. Its prime factorisation is 13 × 41 × 59. Divisors (8): 1, 13, 41, 59, 533, 767, 2419, 31447.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 31447: a happy number: repeatedly adding the squares of its digits reaches 1.
- 2
31447 is composite. Its prime factorisation is
- 3
The divisors add up to 35280; without 31447 itself that is 3833, so 31447 is deficient (3833 is less than 31447). Euler's totient φ(31447) = 27840 numbers up to 31447 share no factor with it.
- 4
The digits of 31447 add up to 19, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 85 steps to reach 1.
LaTeX source of the formulas on this page
\[ 31447 = 13 \times 41 \times 59 \]
31447 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 35280 |
| Euler totient φ(n) | 27840 |
| Square | 988913809 |
| Cube | 31098372551623 |
| Square root | 177.333020 |
| Digit sum / digital root | 19 / 1 |
| Collatz steps to 1 | 85 |
| Scientific notation | 3.1447 × |
31447 in other forms
| Form | Value |
|---|---|
| In words | thirty-one thousand four hundred and forty-seven |
| Binary (base 2) | 111101011010111 |
| Octal (base 8) | 75327 |
| Hexadecimal (base 16) | 7AD7 |
| Base 3 | 1121010201 |
| As time | 31447 seconds = 8 h 44 min 7 s |
Is 31447 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 1) | 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 2) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 1) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 3) | 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 1) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 7) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 9) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 7) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 31447 a prime number?
No. 31447 = 13 × 41 × 59, so it is divisible by 13.
What are the factors of 31447?
1, 13, 41, 59, 533, 767, 2419, 31447.
What is 31447 in binary?
111101011010111 (hexadecimal 7AD7, octal 75327).
What is the square root of 31447?
About 177.3330.
Is 31447 divisible by 3?
No. Its digits add up to 19, which is not a multiple of 3.
What is special about the number 31447?
31447 is a happy number: repeatedly adding the squares of its digits reaches 1.