256486109 has 16 divisors (see below), whose sum is σ = 288199296. Its totient is φ = 226209600.

The previous prime is 256486093. The next prime is 256486127. The reversal of 256486109 is 901684652.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 256486109 - 2⁴ = 256486093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256486129) 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 in 15 ways as a sum of consecutive naturals, for example, 186944 + ... + 188310.

It is an arithmetic number, because the mean of its divisors is an integer number (18012456).

Almost surely, 2^256486109 is an apocalyptic number.

It is an amenable number.

256486109 is a deficient number, since it is larger than the sum of its proper divisors (31713187).

256486109 is a wasteful number, since it uses less digits than its factorization.

256486109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1876.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 256486109 is about 16015.1837017251. The cubic root of 256486109 is about 635.3620676796.

The spelling of 256486109 in words is "two hundred fifty-six million, four hundred eighty-six thousand, one hundred nine".