257791 has 2 divisors, whose sum is σ = 257792. Its totient is φ = 257790.

The previous prime is 257783. The next prime is 257797. The reversal of 257791 is 197752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 257791 - 2³ = 257783 is a prime.

It is a Chen prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128895 + 128896.

It is an arithmetic number, because the mean of its divisors is an integer number (128896).

2²⁵⁷⁷⁹¹ is an apocalyptic number.

257791 is a deficient number, since it is larger than the sum of its proper divisors (1).

257791 is an equidigital number, since it uses as much as digits as its factorization.

257791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4410, while the sum is 31.

The square root of 257791 is about 507.7312281119. The cubic root of 257791 is about 63.6437728541.

The spelling of 257791 in words is "two hundred fifty-seven thousand, seven hundred ninety-one".