256347073 has 2 divisors, whose sum is σ = 256347074. Its totient is φ = 256347072.

The previous prime is 256347067. The next prime is 256347079. The reversal of 256347073 is 370743652.

It is a balanced prime because it is at equal distance from previous prime (256347067) and next prime (256347079).

It can be written as a sum of positive squares in only one way, i.e., 234181809 + 22165264 = 15303^2 + 4708^2 .

It is a cyclic number.

It is not a de Polignac number, because 256347073 - 2²¹ = 254249921 is a prime.

It is not a weakly prime, because it can be changed into another prime (256347079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128173536 + 128173537.

It is an arithmetic number, because the mean of its divisors is an integer number (128173537).

Almost surely, 2^256347073 is an apocalyptic number.

It is an amenable number.

256347073 is a deficient number, since it is larger than the sum of its proper divisors (1).

256347073 is an equidigital number, since it uses as much as digits as its factorization.

256347073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 105840, while the sum is 37.

The square root of 256347073 is about 16010.8423576026. The cubic root of 256347073 is about 635.2472412306.

The spelling of 256347073 in words is "two hundred fifty-six million, three hundred forty-seven thousand, seventy-three".