257705271 has 12 divisors (see below), whose sum is σ = 388425648. Its totient is φ = 164333664.

The previous prime is 257705251. The next prime is 257705293. The reversal of 257705271 is 172507752.

It is a de Polignac number, because none of the positive numbers 2^k-257705271 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257705251) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 622270 + ... + 622683.

It is an arithmetic number, because the mean of its divisors is an integer number (32368804).

Almost surely, 2^257705271 is an apocalyptic number.

257705271 is a deficient number, since it is larger than the sum of its proper divisors (130720377).

257705271 is a wasteful number, since it uses less digits than its factorization.

257705271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1244982 (or 1244979 counting only the distinct ones).

The product of its (nonzero) digits is 34300, while the sum is 36.

The square root of 257705271 is about 16053.2012695288. The cubic root of 257705271 is about 636.3671711003.

The spelling of 257705271 in words is "two hundred fifty-seven million, seven hundred five thousand, two hundred seventy-one".