648257 has 2 divisors, whose sum is σ = 648258. Its totient is φ = 648256.

The previous prime is 648239. The next prime is 648259. The reversal of 648257 is 752846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 633616 + 14641 = 796^2 + 121^2 .

It is a cyclic number.

It is not a de Polignac number, because 648257 - 2¹⁶ = 582721 is a prime.

Together with 648259, it forms a pair of twin primes.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 648257.

It is not a weakly prime, because it can be changed into another prime (648259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324128 + 324129.

It is an arithmetic number, because the mean of its divisors is an integer number (324129).

2⁶⁴⁸²⁵⁷ is an apocalyptic number.

It is an amenable number.

648257 is a deficient number, since it is larger than the sum of its proper divisors (1).

648257 is an equidigital number, since it uses as much as digits as its factorization.

648257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13440, while the sum is 32.

The square root of 648257 is about 805.1440864839. The cubic root of 648257 is about 86.5464127724.

The spelling of 648257 in words is "six hundred forty-eight thousand, two hundred fifty-seven".