256375771 has 2 divisors, whose sum is σ = 256375772. Its totient is φ = 256375770.

The previous prime is 256375729. The next prime is 256375799. The reversal of 256375771 is 177573652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256375771 - 2¹⁷ = 256244699 is a prime.

It is not a weakly prime, because it can be changed into another prime (256370771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128187885 + 128187886.

It is an arithmetic number, because the mean of its divisors is an integer number (128187886).

Almost surely, 2^256375771 is an apocalyptic number.

256375771 is a deficient number, since it is larger than the sum of its proper divisors (1).

256375771 is an equidigital number, since it uses as much as digits as its factorization.

256375771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 308700, while the sum is 43.

The square root of 256375771 is about 16011.7385377104. The cubic root of 256375771 is about 635.2709456103.

The spelling of 256375771 in words is "two hundred fifty-six million, three hundred seventy-five thousand, seven hundred seventy-one".