256551073 has 2 divisors, whose sum is σ = 256551074. Its totient is φ = 256551072.

The previous prime is 256551067. The next prime is 256551077. The reversal of 256551073 is 370155652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 147306769 + 109244304 = 12137^2 + 10452^2 .

It is a cyclic number.

It is not a de Polignac number, because 256551073 - 2⁵ = 256551041 is a prime.

It is not a weakly prime, because it can be changed into another prime (256551077) 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, 128275536 + 128275537.

It is an arithmetic number, because the mean of its divisors is an integer number (128275537).

Almost surely, 2^256551073 is an apocalyptic number.

It is an amenable number.

256551073 is a deficient number, since it is larger than the sum of its proper divisors (1).

256551073 is an equidigital number, since it uses as much as digits as its factorization.

256551073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31500, while the sum is 34.

The square root of 256551073 is about 16017.2117735891. The cubic root of 256551073 is about 635.4157056423.

The spelling of 256551073 in words is "two hundred fifty-six million, five hundred fifty-one thousand, seventy-three".