256540027 has 2 divisors, whose sum is σ = 256540028. Its totient is φ = 256540026.

The previous prime is 256540019. The next prime is 256540043. The reversal of 256540027 is 720045652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256540027 - 2³ = 256540019 is a prime.

It is not a weakly prime, because it can be changed into another prime (256540327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128270013 + 128270014.

It is an arithmetic number, because the mean of its divisors is an integer number (128270014).

Almost surely, 2^256540027 is an apocalyptic number.

256540027 is a deficient number, since it is larger than the sum of its proper divisors (1).

256540027 is an equidigital number, since it uses as much as digits as its factorization.

256540027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 256540027 is about 16016.8669533089. The cubic root of 256540027 is about 635.4065860772.

Adding to 256540027 its reverse (720045652), we get a palindrome (976585679).

The spelling of 256540027 in words is "two hundred fifty-six million, five hundred forty thousand, twenty-seven".