The number 955
955 is a composite number with 4 divisors. Its prime factorisation is 5 × 191. Divisors (4): 1, 5, 191, 955.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 955: a semiprime: 5 × 191, the product of two primes.
- 2
955 is composite. Its prime factorisation is
- 3
The divisors add up to 1152; without 955 itself that is 197, so 955 is deficient (197 is less than 955). Euler's totient φ(955) = 760 numbers up to 955 share no factor with it.
- 4
The digits of 955 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 28 steps to reach 1.
LaTeX source of the formulas on this page
\[ 955 = 5 \times 191 \]
955 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 1152 |
| Euler totient φ(n) | 760 |
| Square | 912025 |
| Cube | 870983875 |
| Square root | 30.903074 |
| Digit sum / digital root | 19 / 1 |
| Collatz steps to 1 | 28 |
| Scientific notation | 9.55 × |
955 in other forms
| Form | Value |
|---|---|
| In words | nine hundred and fifty-five |
| Roman numerals | CMLV |
| Binary (base 2) | 1110111011 |
| Octal (base 8) | 1673 |
| Hexadecimal (base 16) | 3BB |
| Base 3 | 1022101 |
| As time | 955 seconds = 15 min 55 s |
Is 955 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 | Yes (955 ÷ 5 = 191) | 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 3) | 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 5) | 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 955 a prime number?
No. 955 = 5 × 191, so it is divisible by 5.
What are the factors of 955?
1, 5, 191, 955.
What is 955 in binary?
1110111011 (hexadecimal 3BB, octal 1673).
What is the square root of 955?
About 30.9031.
What is 955 in Roman numerals?
CMLV.
Is 955 divisible by 3?
No. Its digits add up to 19, which is not a multiple of 3.
What is special about the number 955?
955 is a semiprime: 5 × 191, the product of two primes.