The number 51389
51389 is a composite number with 8 divisors. Its prime factorisation is 13 × 59 × 67. Divisors (8): 1, 13, 59, 67, 767, 871, 3953, 51389.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
51389 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
51389 is composite. Its prime factorisation is
- 3
The divisors add up to 57120; without 51389 itself that is 5731, so 51389 is deficient (5731 is less than 51389). Euler's totient φ(51389) = 45936 numbers up to 51389 share no factor with it.
- 4
The digits of 51389 add up to 26, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 78 steps to reach 1.
LaTeX source of the formulas on this page
\[ 51389 = 13 \times 59 \times 67 \]
51389 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 57120 |
| Euler totient φ(n) | 45936 |
| Square | 2640829321 |
| Cube | 135709577976869 |
| Square root | 226.691420 |
| Digit sum / digital root | 26 / 8 |
| Collatz steps to 1 | 78 |
| Scientific notation | 5.1389 × |
51389 in other forms
| Form | Value |
|---|---|
| In words | fifty-one thousand three hundred and eighty-nine |
| Binary (base 2) | 1100100010111101 |
| Octal (base 8) | 144275 |
| Hexadecimal (base 16) | C8BD |
| Base 3 | 2121111022 |
| As time | 51389 seconds = 14 h 16 min 29 s |
Is 51389 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 1) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 4) | 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 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 5) | 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 | No (remainder 9) | 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 5) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 51389 a prime number?
No. 51389 = 13 × 59 × 67, so it is divisible by 13.
What are the factors of 51389?
1, 13, 59, 67, 767, 871, 3953, 51389.
What is 51389 in binary?
1100100010111101 (hexadecimal C8BD, octal 144275).
What is the square root of 51389?
About 226.6914.
Is 51389 divisible by 3?
No. Its digits add up to 26, which is not a multiple of 3.
What is special about the number 51389?
It is a composite number with 8 divisors.