257287 has 2 divisors, whose sum is σ = 257288. Its totient is φ = 257286.

The previous prime is 257281. The next prime is 257293. The reversal of 257287 is 782752.

It is a balanced prime because it is at equal distance from previous prime (257281) and next prime (257293).

It is a cyclic number.

It is not a de Polignac number, because 257287 - 2¹¹ = 255239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128643 + 128644.

It is an arithmetic number, because the mean of its divisors is an integer number (128644).

2²⁵⁷²⁸⁷ is an apocalyptic number.

257287 is a deficient number, since it is larger than the sum of its proper divisors (1).

257287 is an equidigital number, since it uses as much as digits as its factorization.

257287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7840, while the sum is 31.

The square root of 257287 is about 507.2346596990. The cubic root of 257287 is about 63.6022697395.

The spelling of 257287 in words is "two hundred fifty-seven thousand, two hundred eighty-seven".