257641871 has 4 divisors (see below), whose sum is σ = 257751144. Its totient is φ = 257532600.

The previous prime is 257641859. The next prime is 257641873. The reversal of 257641871 is 178146752.

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-257641871 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 (257641873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51020 + ... + 55841.

It is an arithmetic number, because the mean of its divisors is an integer number (64437786).

Almost surely, 2^257641871 is an apocalyptic number.

257641871 is a deficient number, since it is larger than the sum of its proper divisors (109273).

257641871 is a wasteful number, since it uses less digits than its factorization.

257641871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109272.

The product of its digits is 94080, while the sum is 41.

The square root of 257641871 is about 16051.2264640432. The cubic root of 257641871 is about 636.3149810054.

The spelling of 257641871 in words is "two hundred fifty-seven million, six hundred forty-one thousand, eight hundred seventy-one".