256823219 has 8 divisors (see below), whose sum is σ = 265256640. Its totient is φ = 248501736.

The previous prime is 256823207. The next prime is 256823227. The reversal of 256823219 is 912328652.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256823219 is a prime.

It is a super-2 number, since 2×256823219² = 131916331635043922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256823299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23309 + ... + 32510.

It is an arithmetic number, because the mean of its divisors is an integer number (33157080).

Almost surely, 2^256823219 is an apocalyptic number.

256823219 is a deficient number, since it is larger than the sum of its proper divisors (8433421).

256823219 is a wasteful number, since it uses less digits than its factorization.

256823219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55969.

The product of its digits is 51840, while the sum is 38.

The square root of 256823219 is about 16025.7049454930. The cubic root of 256823219 is about 635.6403064476.

The spelling of 256823219 in words is "two hundred fifty-six million, eight hundred twenty-three thousand, two hundred nineteen".