256859741 has 2 divisors, whose sum is σ = 256859742. Its totient is φ = 256859740.

The previous prime is 256859723. The next prime is 256859777. The reversal of 256859741 is 147958652.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140327716 + 116532025 = 11846^2 + 10795^2 .

It is a cyclic number.

It is not a de Polignac number, because 256859741 - 2²² = 252665437 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256855741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128429870 + 128429871.

It is an arithmetic number, because the mean of its divisors is an integer number (128429871).

Almost surely, 2^256859741 is an apocalyptic number.

It is an amenable number.

256859741 is a deficient number, since it is larger than the sum of its proper divisors (1).

256859741 is an equidigital number, since it uses as much as digits as its factorization.

256859741 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 604800, while the sum is 47.

The square root of 256859741 is about 16026.8443868405. The cubic root of 256859741 is about 635.6704358041.

The spelling of 256859741 in words is "two hundred fifty-six million, eight hundred fifty-nine thousand, seven hundred forty-one".