256047013 has 8 divisors (see below), whose sum is σ = 271638360. Its totient is φ = 240514560.

The previous prime is 256046981. The next prime is 256047031. The reversal of 256047013 is 310740652.

It can be written as a sum of positive squares in 4 ways, for example, as 133125444 + 122921569 = 11538^2 + 11087^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 256047013 - 2⁵ = 256046981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256047053) 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 7 ways as a sum of consecutive naturals, for example, 5598 + ... + 23311.

It is an arithmetic number, because the mean of its divisors is an integer number (33954795).

Almost surely, 2^256047013 is an apocalyptic number.

It is an amenable number.

256047013 is a deficient number, since it is larger than the sum of its proper divisors (15591347).

256047013 is a wasteful number, since it uses less digits than its factorization.

256047013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29447.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 256047013 is about 16001.4690888056. The cubic root of 256047013 is about 634.9992874111. Note that the first 3 decimals are identical.

Adding to 256047013 its reverse (310740652), we get a palindrome (566787665).

The spelling of 256047013 in words is "two hundred fifty-six million, forty-seven thousand, thirteen".