8640109 has 2 divisors, whose sum is σ = 8640110. Its totient is φ = 8640108.

The previous prime is 8640059. The next prime is 8640133. The reversal of 8640109 is 9010468.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8497225 + 142884 = 2915^2 + 378^2 .

It is a cyclic number.

It is not a de Polignac number, because 8640109 - 2⁹ = 8639597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8640169) 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, 4320054 + 4320055.

It is an arithmetic number, because the mean of its divisors is an integer number (4320055).

Almost surely, 2^8640109 is an apocalyptic number.

It is an amenable number.

8640109 is a deficient number, since it is larger than the sum of its proper divisors (1).

8640109 is an equidigital number, since it uses as much as digits as its factorization.

8640109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 8640109 is about 2939.4062325579. The cubic root of 8640109 is about 205.1979765021.

The spelling of 8640109 in words is "eight million, six hundred forty thousand, one hundred nine".