256585751 has 2 divisors, whose sum is σ = 256585752. Its totient is φ = 256585750.

The previous prime is 256585739. The next prime is 256585783. The reversal of 256585751 is 157585652.

256585751 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256585751 - 2¹⁸ = 256323607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256185751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128292875 + 128292876.

It is an arithmetic number, because the mean of its divisors is an integer number (128292876).

Almost surely, 2^256585751 is an apocalyptic number.

256585751 is a deficient number, since it is larger than the sum of its proper divisors (1).

256585751 is an equidigital number, since it uses as much as digits as its factorization.

256585751 is an evil number, because the sum of its binary digits is even.

The product of its digits is 420000, while the sum is 44.

The square root of 256585751 is about 16018.2942600016. The cubic root of 256585751 is about 635.4443340590. Note that the first 3 decimals are identical.

Subtracting from 256585751 its reverse (157585652), we obtain a palindrome (99000099).

The spelling of 256585751 in words is "two hundred fifty-six million, five hundred eighty-five thousand, seven hundred fifty-one".