| Next prime | 53 |
| Previous prime | 43 |
| Octal | (57)8 |
| Hexadecimal | (2F)16 |
| Prime gap | 6 |
| 10th Sexy prime (the small number) | The big number is 53 . |
| 8th Prime of the Form 4n+3 | |
| 3rd Euler prime number | |
| 4th Double factorial prime | 6!! - 1 |
| 5th Safe prime | |
| 10th Left-truncatable prime |