256004549 has 2 divisors, whose sum is σ = 256004550. Its totient is φ = 256004548.

The previous prime is 256004509. The next prime is 256004557. The reversal of 256004549 is 945400652.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 178035649 + 77968900 = 13343^2 + 8830^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256004549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256004509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128002274 + 128002275.

It is an arithmetic number, because the mean of its divisors is an integer number (128002275).

Almost surely, 2^256004549 is an apocalyptic number.

It is an amenable number.

256004549 is a deficient number, since it is larger than the sum of its proper divisors (1).

256004549 is an equidigital number, since it uses as much as digits as its factorization.

256004549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 256004549 is about 16000.1421556185. The cubic root of 256004549 is about 634.9641817480.

The spelling of 256004549 in words is "two hundred fifty-six million, four thousand, five hundred forty-nine".