256410013 has 4 divisors (see below), whose sum is σ = 258948828. Its totient is φ = 253871200.

The previous prime is 256409999. The next prime is 256410041. The reversal of 256410013 is 310014652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 237067609 + 19342404 = 15397^2 + 4398^2 .

It is a cyclic number.

It is not a de Polignac number, because 256410013 - 2¹⁷ = 256278941 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 (256410053) 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, 1269256 + ... + 1269457.

It is an arithmetic number, because the mean of its divisors is an integer number (64737207).

Almost surely, 2^256410013 is an apocalyptic number.

It is an amenable number.

256410013 is a deficient number, since it is larger than the sum of its proper divisors (2538815).

256410013 is a wasteful number, since it uses less digits than its factorization.

256410013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2538814.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 256410013 is about 16012.8077800241. The cubic root of 256410013 is about 635.2992269871.

Adding to 256410013 its reverse (310014652), we get a palindrome (566424665).

The spelling of 256410013 in words is "two hundred fifty-six million, four hundred ten thousand, thirteen".