The number 31490
31490 is a composite number with 16 divisors. Its prime factorisation is 2 × 5 × 47 × 67. Divisors (16): 1, 2, 5, 10, 47, 67, 94, 134, 235, 335, 470, 670, 3149, 6298, 15745, 31490.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
31490 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
31490 is composite. Its prime factorisation is
- 3
The divisors add up to 58752; without 31490 itself that is 27262, so 31490 is deficient (27262 is less than 31490). Euler's totient φ(31490) = 12144 numbers up to 31490 share no factor with it.
- 4
The digits of 31490 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 116 steps to reach 1.
LaTeX source of the formulas on this page
\[ 31490 = 2 \times 5 \times 47 \times 67 \]
31490 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 16 |
| Sum of divisors | 58752 |
| Euler totient φ(n) | 12144 |
| Square | 991620100 |
| Cube | 31226116949000 |
| Square root | 177.454219 |
| Digit sum / digital root | 17 / 8 |
| Collatz steps to 1 | 116 |
| Scientific notation | 3.149 × |
31490 in other forms
| Form | Value |
|---|---|
| In words | thirty-one thousand four hundred and ninety |
| Binary (base 2) | 111101100000010 |
| Octal (base 8) | 75402 |
| Hexadecimal (base 16) | 7B02 |
| Base 3 | 1121012022 |
| As time | 31490 seconds = 8 h 44 min 50 s |
Is 31490 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (31490 ÷ 2 = 15745) | 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 (31490 ÷ 5 = 6298) | 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 4) | 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 2) | 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 (31490 ÷ 10 = 3149) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 8) | 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 31490 a prime number?
No. 31490 = 2 × 5 × 47 × 67, so it is divisible by 2.
What are the factors of 31490?
1, 2, 5, 10, 47, 67, 94, 134, 235, 335, 470, 670, 3149, 6298, 15745, 31490.
What is 31490 in binary?
111101100000010 (hexadecimal 7B02, octal 75402).
What is the square root of 31490?
About 177.4542.
Is 31490 divisible by 3?
No. Its digits add up to 17, which is not a multiple of 3.
What is special about the number 31490?
It is a composite number with 16 divisors.