256033109 has 2 divisors, whose sum is σ = 256033110. Its totient is φ = 256033108.

The previous prime is 256033091. The next prime is 256033121. The reversal of 256033109 is 901330652.

Together with previous prime (256033091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 242674084 + 13359025 = 15578^2 + 3655^2 .

It is a cyclic number.

It is not a de Polignac number, because 256033109 - 2¹² = 256029013 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 (256033139) 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, 128016554 + 128016555.

It is an arithmetic number, because the mean of its divisors is an integer number (128016555).

Almost surely, 2^256033109 is an apocalyptic number.

It is an amenable number.

256033109 is a deficient number, since it is larger than the sum of its proper divisors (1).

256033109 is an equidigital number, since it uses as much as digits as its factorization.

256033109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 29.

The square root of 256033109 is about 16001.0346227986. The cubic root of 256033109 is about 634.9877931809.

The spelling of 256033109 in words is "two hundred fifty-six million, thirty-three thousand, one hundred nine".