256886093 has 2 divisors, whose sum is σ = 256886094. Its totient is φ = 256886092.

The previous prime is 256886087. The next prime is 256886111. The reversal of 256886093 is 390688652.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 254019844 + 2866249 = 15938^2 + 1693^2 .

It is a cyclic number.

It is not a de Polignac number, because 256886093 - 2¹² = 256881997 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256886293) 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, 128443046 + 128443047.

It is an arithmetic number, because the mean of its divisors is an integer number (128443047).

Almost surely, 2^256886093 is an apocalyptic number.

It is an amenable number.

256886093 is a deficient number, since it is larger than the sum of its proper divisors (1).

256886093 is an equidigital number, since it uses as much as digits as its factorization.

256886093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 622080, while the sum is 47.

The square root of 256886093 is about 16027.6664864228. Note that the first 3 decimals coincide. The cubic root of 256886093 is about 635.6921734970.

The spelling of 256886093 in words is "two hundred fifty-six million, eight hundred eighty-six thousand, ninety-three".