256145 has 4 divisors (see below), whose sum is σ = 307380. Its totient is φ = 204912.

The previous prime is 256133. The next prime is 256147. The reversal of 256145 is 541652.

256145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 66049 + 190096 = 257^2 + 436^2 .

It is a cyclic number.

It is not a de Polignac number, because 256145 - 2⁴ = 256129 is a prime.

It is a super-2 number, since 2×256145² = 131220522050, which contains 22 as substring.

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

It is a nialpdrome in base 8.

It is a self number, because there is not a number n which added to its sum of digits gives 256145.

It is not an unprimeable number, because it can be changed into a prime (256147) 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, 25610 + ... + 25619.

It is an arithmetic number, because the mean of its divisors is an integer number (76845).

2²⁵⁶¹⁴⁵ is an apocalyptic number.

It is an amenable number.

256145 is a deficient number, since it is larger than the sum of its proper divisors (51235).

256145 is an equidigital number, since it uses as much as digits as its factorization.

256145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51234.

The product of its digits is 1200, while the sum is 23.

The square root of 256145 is about 506.1076960490. The cubic root of 256145 is about 63.5080280011.

Adding to 256145 its reverse (541652), we get a palindrome (797797).

The spelling of 256145 in words is "two hundred fifty-six thousand, one hundred forty-five".