656008109 has 2 divisors, whose sum is σ = 656008110. Its totient is φ = 656008108.

The previous prime is 656008103. The next prime is 656008123. The reversal of 656008109 is 901800656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 421152484 + 234855625 = 20522^2 + 15325^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-656008109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656008103) 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, 328004054 + 328004055.

It is an arithmetic number, because the mean of its divisors is an integer number (328004055).

Almost surely, 2^656008109 is an apocalyptic number.

It is an amenable number.

656008109 is a deficient number, since it is larger than the sum of its proper divisors (1).

656008109 is an equidigital number, since it uses as much as digits as its factorization.

656008109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 656008109 is about 25612.6552508716. The cubic root of 656008109 is about 868.8998773626.

The spelling of 656008109 in words is "six hundred fifty-six million, eight thousand, one hundred nine".