256560797 has 2 divisors, whose sum is σ = 256560798. Its totient is φ = 256560796.

The previous prime is 256560769. The next prime is 256560809. The reversal of 256560797 is 797065652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 247716121 + 8844676 = 15739^2 + 2974^2 .

It is a cyclic number.

It is not a de Polignac number, because 256560797 - 2¹⁰ = 256559773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256590797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128280398 + 128280399.

It is an arithmetic number, because the mean of its divisors is an integer number (128280399).

Almost surely, 2^256560797 is an apocalyptic number.

It is an amenable number.

256560797 is a deficient number, since it is larger than the sum of its proper divisors (1).

256560797 is an equidigital number, since it uses as much as digits as its factorization.

256560797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 793800, while the sum is 47.

The square root of 256560797 is about 16017.5153191748. The cubic root of 256560797 is about 635.4237335490.

The spelling of 256560797 in words is "two hundred fifty-six million, five hundred sixty thousand, seven hundred ninety-seven".