108689905 has 8 divisors (see below), whose sum is σ = 133953192. Its totient is φ = 84601728.

The previous prime is 108689873. The next prime is 108689921. The reversal of 108689905 is 509986801.

It can be written as a sum of positive squares in 4 ways, for example, as 15586704 + 93103201 = 3948^2 + 9649^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 108689905 - 2⁵ = 108689873 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 293572 + ... + 293941.

It is an arithmetic number, because the mean of its divisors is an integer number (16744149).

Almost surely, 2^108689905 is an apocalyptic number.

It is an amenable number.

108689905 is a deficient number, since it is larger than the sum of its proper divisors (25263287).

108689905 is an equidigital number, since it uses as much as digits as its factorization.

108689905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 587555.

The product of its (nonzero) digits is 155520, while the sum is 46.

The square root of 108689905 is about 10425.4450744321. The cubic root of 108689905 is about 477.2321972647.

The spelling of 108689905 in words is "one hundred eight million, six hundred eighty-nine thousand, nine hundred five".