257487511 has 2 divisors, whose sum is σ = 257487512. Its totient is φ = 257487510.

The previous prime is 257487509. The next prime is 257487541. The reversal of 257487511 is 115784752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 257487511 - 2¹ = 257487509 is a prime.

Together with 257487509, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257487541) 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, 128743755 + 128743756.

It is an arithmetic number, because the mean of its divisors is an integer number (128743756).

Almost surely, 2^257487511 is an apocalyptic number.

257487511 is a deficient number, since it is larger than the sum of its proper divisors (1).

257487511 is an equidigital number, since it uses as much as digits as its factorization.

257487511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 78400, while the sum is 40.

The square root of 257487511 is about 16046.4173883144. The cubic root of 257487511 is about 636.1878779556.

The spelling of 257487511 in words is "two hundred fifty-seven million, four hundred eighty-seven thousand, five hundred eleven".