256223313 has 6 divisors (see below), whose sum is σ = 370100354. Its totient is φ = 170815536.

The previous prime is 256223311. The next prime is 256223321. The reversal of 256223313 is 313322652.

256223313 is a `hidden beast` number, since 2 + 5 + 622 + 3 + 31 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 212226624 + 43996689 = 14568^2 + 6633^2 .

It is not a de Polignac number, because 256223313 - 2¹ = 256223311 is a prime.

It is a super-2 number, since 2×256223313² = 131300772249391938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256223311) 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 5 ways as a sum of consecutive naturals, for example, 14234620 + ... + 14234637.

Almost surely, 2^256223313 is an apocalyptic number.

It is an amenable number.

256223313 is a deficient number, since it is larger than the sum of its proper divisors (113877041).

256223313 is a wasteful number, since it uses less digits than its factorization.

256223313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28469263 (or 28469260 counting only the distinct ones).

The product of its digits is 6480, while the sum is 27.

The square root of 256223313 is about 16006.9770100416. The cubic root of 256223313 is about 635.1449959258.

Adding to 256223313 its reverse (313322652), we get a palindrome (569545965).

The spelling of 256223313 in words is "two hundred fifty-six million, two hundred twenty-three thousand, three hundred thirteen".