256823113 has 4 divisors (see below), whose sum is σ = 256855168. Its totient is φ = 256791060.

The previous prime is 256823111. The next prime is 256823141. The reversal of 256823113 is 311328652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 256823113 - 2¹ = 256823111 is a prime.

It is a super-2 number, since 2×256823113² = 131916222742021538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256823111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7708 + ... + 23938.

It is an arithmetic number, because the mean of its divisors is an integer number (64213792).

Almost surely, 2^256823113 is an apocalyptic number.

It is an amenable number.

256823113 is a deficient number, since it is larger than the sum of its proper divisors (32055).

256823113 is a wasteful number, since it uses less digits than its factorization.

256823113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32054.

The product of its digits is 8640, while the sum is 31.

The square root of 256823113 is about 16025.7016383059. The cubic root of 256823113 is about 635.6402189972.

The spelling of 256823113 in words is "two hundred fifty-six million, eight hundred twenty-three thousand, one hundred thirteen".