108688321 has 6 divisors (see below), whose sum is σ = 126433410. Its totient is φ = 93161376.

The previous prime is 108688309. The next prime is 108688339. The reversal of 108688321 is 123886801.

It can be written as a sum of positive squares in only one way, i.e., 106316721 + 2371600 = 10311^2 + 1540^2 .

It is not a de Polignac number, because 108688321 - 2⁵ = 108688289 is a prime.

It is a super-2 number, since 2×108688321² = 23626302243598082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (108680321) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1109016 + ... + 1109113.

It is an arithmetic number, because the mean of its divisors is an integer number (21072235).

Almost surely, 2^108688321 is an apocalyptic number.

It is an amenable number.

108688321 is a deficient number, since it is larger than the sum of its proper divisors (17745089).

108688321 is an equidigital number, since it uses as much as digits as its factorization.

108688321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2218143 (or 2218136 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 37.

The square root of 108688321 is about 10425.3691061756. The cubic root of 108688321 is about 477.2298789277.

The spelling of 108688321 in words is "one hundred eight million, six hundred eighty-eight thousand, three hundred twenty-one".