257306243 has 2 divisors, whose sum is σ = 257306244. Its totient is φ = 257306242.

The previous prime is 257306233. The next prime is 257306263. The reversal of 257306243 is 342603752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 257306243 - 2⁸ = 257305987 is a prime.

It is not a weakly prime, because it can be changed into another prime (257306233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128653121 + 128653122.

It is an arithmetic number, because the mean of its divisors is an integer number (128653122).

Almost surely, 2^257306243 is an apocalyptic number.

257306243 is a deficient number, since it is larger than the sum of its proper divisors (1).

257306243 is an equidigital number, since it uses as much as digits as its factorization.

257306243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 32.

The square root of 257306243 is about 16040.7681549233. The cubic root of 257306243 is about 636.0385534624.

Adding to 257306243 its reverse (342603752), we get a palindrome (599909995).

The spelling of 257306243 in words is "two hundred fifty-seven million, three hundred six thousand, two hundred forty-three".