257298917 has 2 divisors, whose sum is σ = 257298918. Its totient is φ = 257298916.

The previous prime is 257298913. The next prime is 257298947. The reversal of 257298917 is 719892752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 251888641 + 5410276 = 15871^2 + 2326^2 .

It is a cyclic number.

It is not a de Polignac number, because 257298917 - 2² = 257298913 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257298913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128649458 + 128649459.

It is an arithmetic number, because the mean of its divisors is an integer number (128649459).

Almost surely, 2^257298917 is an apocalyptic number.

It is an amenable number.

257298917 is a deficient number, since it is larger than the sum of its proper divisors (1).

257298917 is an equidigital number, since it uses as much as digits as its factorization.

257298917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 635040, while the sum is 50.

The square root of 257298917 is about 16040.5397976502. The cubic root of 257298917 is about 636.0325169944.

The spelling of 257298917 in words is "two hundred fifty-seven million, two hundred ninety-eight thousand, nine hundred seventeen".