108589721 has 4 divisors (see below), whose sum is σ = 108731700. Its totient is φ = 108447744.

The previous prime is 108589711. The next prime is 108589753. The reversal of 108589721 is 127985801.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 127985801 = 443 ⋅288907.

It can be written as a sum of positive squares in 2 ways, for example, as 31764496 + 76825225 = 5636^2 + 8765^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-108589721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (108589711) 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, 69836 + ... + 71373.

It is an arithmetic number, because the mean of its divisors is an integer number (27182925).

Almost surely, 2^108589721 is an apocalyptic number.

It is an amenable number.

108589721 is a deficient number, since it is larger than the sum of its proper divisors (141979).

108589721 is an equidigital number, since it uses as much as digits as its factorization.

108589721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141978.

The product of its (nonzero) digits is 40320, while the sum is 41.

The square root of 108589721 is about 10420.6391838505. The cubic root of 108589721 is about 477.0855239443.

The spelling of 108589721 in words is "one hundred eight million, five hundred eighty-nine thousand, seven hundred twenty-one".