257266393 has 2 divisors, whose sum is σ = 257266394. Its totient is φ = 257266392.

The previous prime is 257266379. The next prime is 257266411. The reversal of 257266393 is 393662752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210917529 + 46348864 = 14523^2 + 6808^2 .

It is a cyclic number.

It is not a de Polignac number, because 257266393 - 2¹⁷ = 257135321 is a prime.

It is not a weakly prime, because it can be changed into another prime (257266363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128633196 + 128633197.

It is an arithmetic number, because the mean of its divisors is an integer number (128633197).

Almost surely, 2^257266393 is an apocalyptic number.

It is an amenable number.

257266393 is a deficient number, since it is larger than the sum of its proper divisors (1).

257266393 is an equidigital number, since it uses as much as digits as its factorization.

257266393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 408240, while the sum is 43.

The square root of 257266393 is about 16039.5259593293. The cubic root of 257266393 is about 636.0057165276.

The spelling of 257266393 in words is "two hundred fifty-seven million, two hundred sixty-six thousand, three hundred ninety-three".