256759691 has 2 divisors, whose sum is σ = 256759692. Its totient is φ = 256759690.

The previous prime is 256759669. The next prime is 256759703. The reversal of 256759691 is 196957652.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256759691 - 2⁶ = 256759627 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (256759651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128379845 + 128379846.

It is an arithmetic number, because the mean of its divisors is an integer number (128379846).

Almost surely, 2^256759691 is an apocalyptic number.

256759691 is a deficient number, since it is larger than the sum of its proper divisors (1).

256759691 is an equidigital number, since it uses as much as digits as its factorization.

256759691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1020600, while the sum is 50.

The square root of 256759691 is about 16023.7227572122. The cubic root of 256759691 is about 635.5878912915.

The spelling of 256759691 in words is "two hundred fifty-six million, seven hundred fifty-nine thousand, six hundred ninety-one".