256918427 has 2 divisors, whose sum is σ = 256918428. Its totient is φ = 256918426.

The previous prime is 256918393. The next prime is 256918439. The reversal of 256918427 is 724819652.

It is a happy number.

256918427 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256918427 - 2¹⁴ = 256902043 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (256918477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128459213 + 128459214.

It is an arithmetic number, because the mean of its divisors is an integer number (128459214).

Almost surely, 2^256918427 is an apocalyptic number.

256918427 is a deficient number, since it is larger than the sum of its proper divisors (1).

256918427 is an equidigital number, since it uses as much as digits as its factorization.

256918427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 44.

The square root of 256918427 is about 16028.6751479965. The cubic root of 256918427 is about 635.7188436944.

The spelling of 256918427 in words is "two hundred fifty-six million, nine hundred eighteen thousand, four hundred twenty-seven".