256007771 has 2 divisors, whose sum is σ = 256007772. Its totient is φ = 256007770.

The previous prime is 256007761. The next prime is 256007819. The reversal of 256007771 is 177700652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256007771 - 2⁶ = 256007707 is a prime.

It is not a weakly prime, because it can be changed into another prime (256007711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128003885 + 128003886.

It is an arithmetic number, because the mean of its divisors is an integer number (128003886).

Almost surely, 2^256007771 is an apocalyptic number.

256007771 is a deficient number, since it is larger than the sum of its proper divisors (1).

256007771 is an equidigital number, since it uses as much as digits as its factorization.

256007771 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20580, while the sum is 35.

The square root of 256007771 is about 16000.2428419071. The cubic root of 256007771 is about 634.9668455627.

The spelling of 256007771 in words is "two hundred fifty-six million, seven thousand, seven hundred seventy-one".