256741 has 4 divisors (see below), whose sum is σ = 260332. Its totient is φ = 253152.

The previous prime is 256723. The next prime is 256757. The reversal of 256741 is 147652.

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

It can be written as a sum of positive squares in 2 ways, for example, as 206116 + 50625 = 454^2 + 225^2 .

It is a cyclic number.

It is not a de Polignac number, because 256741 - 2¹⁷ = 125669 is a prime.

It is an Ulam number.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

256741 is a lucky number.

It is a nialpdrome in base 15.

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 3 ways as a sum of consecutive naturals, for example, 1686 + ... + 1831.

It is an arithmetic number, because the mean of its divisors is an integer number (65083).

2²⁵⁶⁷⁴¹ is an apocalyptic number.

It is an amenable number.

256741 is a deficient number, since it is larger than the sum of its proper divisors (3591).

256741 is an equidigital number, since it uses as much as digits as its factorization.

256741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3590.

The product of its digits is 1680, while the sum is 25.

The square root of 256741 is about 506.6961614222. The cubic root of 256741 is about 63.5572468230.

The spelling of 256741 in words is "two hundred fifty-six thousand, seven hundred forty-one".