257485871 has 4 divisors (see below), whose sum is σ = 259451544. Its totient is φ = 255520200.

The previous prime is 257485841. The next prime is 257485903. The reversal of 257485871 is 178584752.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257485871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257485841) 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 in 3 ways as a sum of consecutive naturals, for example, 982640 + ... + 982901.

It is an arithmetic number, because the mean of its divisors is an integer number (64862886).

Almost surely, 2^257485871 is an apocalyptic number.

257485871 is a deficient number, since it is larger than the sum of its proper divisors (1965673).

257485871 is a wasteful number, since it uses less digits than its factorization.

257485871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1965672.

The product of its digits is 627200, while the sum is 47.

The square root of 257485871 is about 16046.3662864837. The cubic root of 257485871 is about 636.1865272747.

The spelling of 257485871 in words is "two hundred fifty-seven million, four hundred eighty-five thousand, eight hundred seventy-one".