257 is a prime number from 201-300. 257 has 2 factors, 1 and 257. It is the 55th prime number, and the ninth prime number from 201-300.
It is also the fourth Fermat number.
Relationship with other odd numbers
The numbers before
- The previous prime number is 251.
- In particular, 253 is divisible by 11 and 23.
- 251 and 257 are six numbers apart; therefore, they are sexy primes.
- The previous prime number before 251 is 241.