256711 has 18 divisors (see below), whose sum is σ = 333792. Its totient is φ = 196560.

The previous prime is 256699. The next prime is 256721. The reversal of 256711 is 117652.

It is not a de Polignac number, because 256711 - 2⁹ = 256199 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 (256721) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 8266 + ... + 8296.

It is an arithmetic number, because the mean of its divisors is an integer number (18544).

2²⁵⁶⁷¹¹ is an apocalyptic number.

256711 is a deficient number, since it is larger than the sum of its proper divisors (77081).

256711 is a wasteful number, since it uses less digits than its factorization.

256711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71 (or 51 counting only the distinct ones).

The product of its digits is 420, while the sum is 22.

The square root of 256711 is about 506.6665570175. Note that the first 3 decimals coincide. The cubic root of 256711 is about 63.5547711871.

The spelling of 256711 in words is "two hundred fifty-six thousand, seven hundred eleven".