The number 61997
61997 is a composite number with 8 divisors. Its prime factorisation is 13 × 19 × 251. Divisors (8): 1, 13, 19, 247, 251, 3263, 4769, 61997.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
61997 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
61997 is composite. Its prime factorisation is
- 3
The divisors add up to 70560; without 61997 itself that is 8563, so 61997 is deficient (8563 is less than 61997). Euler's totient φ(61997) = 54000 numbers up to 61997 share no factor with it.
- 4
The digits of 61997 add up to 32, and repeating that until one digit is left gives the digital root 5. The Collatz sequence (halve if even, else 3n+1) takes 179 steps to reach 1.
LaTeX source of the formulas on this page
\[ 61997 = 13 \times 19 \times 251 \]
61997 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 70560 |
| Euler totient φ(n) | 54000 |
| Square | 3843628009 |
| Cube | 238293405673973 |
| Square root | 248.991968 |
| Digit sum / digital root | 32 / 5 |
| Collatz steps to 1 | 179 |
| Scientific notation | 6.1997 × |
61997 in other forms
| Form | Value |
|---|---|
| In words | sixty-one thousand nine hundred and ninety-seven |
| Binary (base 2) | 1111001000101101 |
| Octal (base 8) | 171055 |
| Hexadecimal (base 16) | F22D |
| Base 3 | 10011001012 |
| As time | 61997 seconds = 17 h 13 min 17 s |
Is 61997 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 2) | 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 5) | 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 5) | 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 1) | 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 61997 a prime number?
No. 61997 = 13 × 19 × 251, so it is divisible by 13.
What are the factors of 61997?
1, 13, 19, 247, 251, 3263, 4769, 61997.
What is 61997 in binary?
1111001000101101 (hexadecimal F22D, octal 171055).
What is the square root of 61997?
About 248.9920.
Is 61997 divisible by 3?
No. Its digits add up to 32, which is not a multiple of 3.
What is special about the number 61997?
It is a composite number with 8 divisors.