256941863 has 2 divisors, whose sum is σ = 256941864. Its totient is φ = 256941862.

The previous prime is 256941803. The next prime is 256941887. The reversal of 256941863 is 368149652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256941863 - 2¹⁶ = 256876327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256941803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128470931 + 128470932.

It is an arithmetic number, because the mean of its divisors is an integer number (128470932).

Almost surely, 2^256941863 is an apocalyptic number.

256941863 is a deficient number, since it is larger than the sum of its proper divisors (1).

256941863 is an equidigital number, since it uses as much as digits as its factorization.

256941863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 44.

The square root of 256941863 is about 16029.4061961134. The cubic root of 256941863 is about 635.7381731160.

The spelling of 256941863 in words is "two hundred fifty-six million, nine hundred forty-one thousand, eight hundred sixty-three".