256105 has 16 divisors (see below), whose sum is σ = 342144. Its totient is φ = 183040.

The previous prime is 256093. The next prime is 256117. The reversal of 256105 is 501652.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (256093) and next prime (256117).

It is not a de Polignac number, because 256105 - 2⁷ = 255977 is a prime.

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

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1890 + ... + 2020.

It is an arithmetic number, because the mean of its divisors is an integer number (21384).

2²⁵⁶¹⁰⁵ is an apocalyptic number.

It is an amenable number.

256105 is a deficient number, since it is larger than the sum of its proper divisors (86039).

256105 is a wasteful number, since it uses less digits than its factorization.

256105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 256105 is about 506.0681772252. The cubic root of 256105 is about 63.5047219916.

Adding to 256105 its reverse (501652), we get a palindrome (757757).

It can be divided in two parts, 256 and 105, that added together give a square (361 = 19²).

The spelling of 256105 in words is "two hundred fifty-six thousand, one hundred five".