257485903 has 2 divisors, whose sum is σ = 257485904. Its totient is φ = 257485902.

The previous prime is 257485841. The next prime is 257485909. The reversal of 257485903 is 309584752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 257485903 - 2¹⁷ = 257354831 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 257485903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257485909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128742951 + 128742952.

It is an arithmetic number, because the mean of its divisors is an integer number (128742952).

Almost surely, 2^257485903 is an apocalyptic number.

257485903 is a deficient number, since it is larger than the sum of its proper divisors (1).

257485903 is an equidigital number, since it uses as much as digits as its factorization.

257485903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 302400, while the sum is 43.

The square root of 257485903 is about 16046.3672835941. The cubic root of 257485903 is about 636.1865536295.

The spelling of 257485903 in words is "two hundred fifty-seven million, four hundred eighty-five thousand, nine hundred three".