108661985 has 8 divisors (see below), whose sum is σ = 134890920. Its totient is φ = 83931904.

The previous prime is 108661981. The next prime is 108662017. The reversal of 108661985 is 589166801.

It can be written as a sum of positive squares in 4 ways, for example, as 39589264 + 69072721 = 6292^2 + 8311^2 .

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 108661985 - 2² = 108661981 is a prime.

It is not an unprimeable number, because it can be changed into a prime (108661981) 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 in 7 ways as a sum of consecutive naturals, for example, 374552 + ... + 374841.

It is an arithmetic number, because the mean of its divisors is an integer number (16861365).

Almost surely, 2^108661985 is an apocalyptic number.

It is an amenable number.

108661985 is a deficient number, since it is larger than the sum of its proper divisors (26228935).

108661985 is an equidigital number, since it uses as much as digits as its factorization.

108661985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 749427.

The product of its (nonzero) digits is 103680, while the sum is 44.

The square root of 108661985 is about 10424.1059568675. The cubic root of 108661985 is about 477.1913303476.

The spelling of 108661985 in words is "one hundred eight million, six hundred sixty-one thousand, nine hundred eighty-five".