256406011 has 2 divisors, whose sum is σ = 256406012. Its totient is φ = 256406010.

The previous prime is 256405999. The next prime is 256406039. The reversal of 256406011 is 110604652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256406011 - 2⁵ = 256405979 is a prime.

It is not a weakly prime, because it can be changed into another prime (256401011) 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 as a sum of consecutive naturals, namely, 128203005 + 128203006.

It is an arithmetic number, because the mean of its divisors is an integer number (128203006).

Almost surely, 2^256406011 is an apocalyptic number.

256406011 is a deficient number, since it is larger than the sum of its proper divisors (1).

256406011 is an equidigital number, since it uses as much as digits as its factorization.

256406011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 256406011 is about 16012.6828170672. The cubic root of 256406011 is about 635.2959217590.

The spelling of 256406011 in words is "two hundred fifty-six million, four hundred six thousand, eleven".