256243927 has 2 divisors, whose sum is σ = 256243928. Its totient is φ = 256243926.

The previous prime is 256243853. The next prime is 256243931. The reversal of 256243927 is 729342652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256243927 - 2¹⁵ = 256211159 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256243927.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256243957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128121963 + 128121964.

It is an arithmetic number, because the mean of its divisors is an integer number (128121964).

Almost surely, 2^256243927 is an apocalyptic number.

256243927 is a deficient number, since it is larger than the sum of its proper divisors (1).

256243927 is an equidigital number, since it uses as much as digits as its factorization.

256243927 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 40.

The square root of 256243927 is about 16007.6209038070. The cubic root of 256243927 is about 635.1620286302.

The spelling of 256243927 in words is "two hundred fifty-six million, two hundred forty-three thousand, nine hundred twenty-seven".