256187563 has 2 divisors, whose sum is σ = 256187564. Its totient is φ = 256187562.

The previous prime is 256187527. The next prime is 256187641. The reversal of 256187563 is 365781652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256187563 - 2¹⁷ = 256056491 is a prime.

It is not a weakly prime, because it can be changed into another prime (256187513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128093781 + 128093782.

It is an arithmetic number, because the mean of its divisors is an integer number (128093782).

Almost surely, 2^256187563 is an apocalyptic number.

256187563 is a deficient number, since it is larger than the sum of its proper divisors (1).

256187563 is an equidigital number, since it uses as much as digits as its factorization.

256187563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 302400, while the sum is 43.

The square root of 256187563 is about 16005.8602705384. The cubic root of 256187563 is about 635.1154546512.

The spelling of 256187563 in words is "two hundred fifty-six million, one hundred eighty-seven thousand, five hundred sixty-three".