256103 has 4 divisors (see below), whose sum is σ = 261600. Its totient is φ = 250608.

The previous prime is 256093. The next prime is 256117. The reversal of 256103 is 301652.

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 256103 - 2⁸ = 255847 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2678 + ... + 2771.

It is an arithmetic number, because the mean of its divisors is an integer number (65400).

2²⁵⁶¹⁰³ is an apocalyptic number.

256103 is a deficient number, since it is larger than the sum of its proper divisors (5497).

256103 is an equidigital number, since it uses as much as digits as its factorization.

256103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5496.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 256103 is about 506.0662012030. The cubic root of 256103 is about 63.5045566821.

Adding to 256103 its reverse (301652), we get a palindrome (557755).

The spelling of 256103 in words is "two hundred fifty-six thousand, one hundred three".