256413863 has 2 divisors, whose sum is σ = 256413864. Its totient is φ = 256413862.

The previous prime is 256413847. The next prime is 256413869. The reversal of 256413863 is 368314652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256413863 - 2⁴ = 256413847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256413869) 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 as a sum of consecutive naturals, namely, 128206931 + 128206932.

It is an arithmetic number, because the mean of its divisors is an integer number (128206932).

Almost surely, 2^256413863 is an apocalyptic number.

256413863 is a deficient number, since it is larger than the sum of its proper divisors (1).

256413863 is an equidigital number, since it uses as much as digits as its factorization.

256413863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 38.

The square root of 256413863 is about 16012.9279958414. The cubic root of 256413863 is about 635.3024066468.

The spelling of 256413863 in words is "two hundred fifty-six million, four hundred thirteen thousand, eight hundred sixty-three".