256919 has 4 divisors (see below), whose sum is σ = 276696. Its totient is φ = 237144.

The previous prime is 256903. The next prime is 256931. The reversal of 256919 is 919652.

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 256919 - 2⁴ = 256903 is a prime.

It is a super-2 number, since 2×256919² = 132014745122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9869 + ... + 9894.

It is an arithmetic number, because the mean of its divisors is an integer number (69174).

2²⁵⁶⁹¹⁹ is an apocalyptic number.

256919 is a deficient number, since it is larger than the sum of its proper divisors (19777).

256919 is a wasteful number, since it uses less digits than its factorization.

256919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19776.

The product of its digits is 4860, while the sum is 32.

The square root of 256919 is about 506.8717786581. The cubic root of 256919 is about 63.5719316304.

The spelling of 256919 in words is "two hundred fifty-six thousand, nine hundred nineteen".