108689281 has 4 divisors (see below), whose sum is σ = 108826452. Its totient is φ = 108552112.

The previous prime is 108689261. The next prime is 108689293. The reversal of 108689281 is 182986801.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 74114881 + 34574400 = 8609^2 + 5880^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-108689281 is a prime.

It is a super-2 number, since 2×108689281² = 23626719608593922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (108689201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67390 + ... + 68983.

It is an arithmetic number, because the mean of its divisors is an integer number (27206613).

Almost surely, 2^108689281 is an apocalyptic number.

It is an amenable number.

108689281 is a deficient number, since it is larger than the sum of its proper divisors (137171).

108689281 is an equidigital number, since it uses as much as digits as its factorization.

108689281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137170.

The product of its (nonzero) digits is 55296, while the sum is 43.

The square root of 108689281 is about 10425.4151476092. The cubic root of 108689281 is about 477.2312839831.

The spelling of 108689281 in words is "one hundred eight million, six hundred eighty-nine thousand, two hundred eighty-one".