256115 has 8 divisors (see below), whose sum is σ = 310128. Its totient is φ = 203040.

The previous prime is 256093. The next prime is 256117. The reversal of 256115 is 511652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256115 - 2⁸ = 255859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256117) 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 7 ways as a sum of consecutive naturals, for example, 764 + ... + 1046.

It is an arithmetic number, because the mean of its divisors is an integer number (38766).

2²⁵⁶¹¹⁵ is an apocalyptic number.

256115 is a deficient number, since it is larger than the sum of its proper divisors (54013).

256115 is a wasteful number, since it uses less digits than its factorization.

256115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469.

The product of its digits is 300, while the sum is 20.

The square root of 256115 is about 506.0780572204. The cubic root of 256115 is about 63.5055485263.

Adding to 256115 its reverse (511652), we get a palindrome (767767).

The spelling of 256115 in words is "two hundred fifty-six thousand, one hundred fifteen".