257208943 has 2 divisors, whose sum is σ = 257208944. Its totient is φ = 257208942.

The previous prime is 257208899. The next prime is 257208971. The reversal of 257208943 is 349802752.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257208943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 257208896 and 257208905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257208043) 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, 128604471 + 128604472.

It is an arithmetic number, because the mean of its divisors is an integer number (128604472).

Almost surely, 2^257208943 is an apocalyptic number.

257208943 is a deficient number, since it is larger than the sum of its proper divisors (1).

257208943 is an equidigital number, since it uses as much as digits as its factorization.

257208943 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 257208943 is about 16037.7349709989. The cubic root of 257208943 is about 635.9583709881.

The spelling of 257208943 in words is "two hundred fifty-seven million, two hundred eight thousand, nine hundred forty-three".