256315 has 4 divisors (see below), whose sum is σ = 307584. Its totient is φ = 205048.

The previous prime is 256313. The next prime is 256337. The reversal of 256315 is 513652.

It is a happy number.

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 256315 - 2¹ = 256313 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256313) 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, 25627 + ... + 25636.

It is an arithmetic number, because the mean of its divisors is an integer number (76896).

256315 is a Friedman number, since it can be written as 51263*5, using all its digits and the basic arithmetic operations.

2²⁵⁶³¹⁵ is an apocalyptic number.

256315 is a deficient number, since it is larger than the sum of its proper divisors (51269).

256315 is an equidigital number, since it uses as much as digits as its factorization.

256315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51268.

The product of its digits is 900, while the sum is 22.

The square root of 256315 is about 506.2756166358. The cubic root of 256315 is about 63.5220747027.

Adding to 256315 its reverse (513652), we get a palindrome (769967).

The spelling of 256315 in words is "two hundred fifty-six thousand, three hundred fifteen".