108689657 has 2 divisors, whose sum is σ = 108689658. Its totient is φ = 108689656.

The previous prime is 108689641. The next prime is 108689771. The reversal of 108689657 is 756986801.

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., 108597241 + 92416 = 10421^2 + 304^2 .

It is a cyclic number.

It is not a de Polignac number, because 108689657 - 2⁴ = 108689641 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (108682657) 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, 54344828 + 54344829.

It is an arithmetic number, because the mean of its divisors is an integer number (54344829).

Almost surely, 2^108689657 is an apocalyptic number.

It is an amenable number.

108689657 is a deficient number, since it is larger than the sum of its proper divisors (1).

108689657 is an equidigital number, since it uses as much as digits as its factorization.

108689657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 725760, while the sum is 50.

The square root of 108689657 is about 10425.4331804487. The cubic root of 108689657 is about 477.2318342942.

The spelling of 108689657 in words is "one hundred eight million, six hundred eighty-nine thousand, six hundred fifty-seven".