256411 has 4 divisors (see below), whose sum is σ = 271512. Its totient is φ = 241312.

The previous prime is 256393. The next prime is 256423. The reversal of 256411 is 114652.

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

It is a cyclic number.

It is not a de Polignac number, because 256411 - 2¹⁷ = 125339 is a prime.

It is an Ulam number.

It is a Duffinian number.

256411 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (256441) 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, 7525 + ... + 7558.

It is an arithmetic number, because the mean of its divisors is an integer number (67878).

2²⁵⁶⁴¹¹ is an apocalyptic number.

256411 is a deficient number, since it is larger than the sum of its proper divisors (15101).

256411 is a wasteful number, since it uses less digits than its factorization.

256411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15100.

The product of its digits is 240, while the sum is 19.

The square root of 256411 is about 506.3704177773. The cubic root of 256411 is about 63.5300042139.

The spelling of 256411 in words is "two hundred fifty-six thousand, four hundred eleven".