108989891 has 2 divisors, whose sum is σ = 108989892. Its totient is φ = 108989890.

The previous prime is 108989869. The next prime is 108989921. The reversal of 108989891 is 198989801.

It is a weak prime.

It is an emirp because it is prime and its reverse (198989801) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 108989891 - 2¹⁴ = 108973507 is a prime.

It is not a weakly prime, because it can be changed into another prime (108989191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54494945 + 54494946.

It is an arithmetic number, because the mean of its divisors is an integer number (54494946).

Almost surely, 2^108989891 is an apocalyptic number.

108989891 is a deficient number, since it is larger than the sum of its proper divisors (1).

108989891 is an equidigital number, since it uses as much as digits as its factorization.

108989891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 53.

The square root of 108989891 is about 10439.8223643892. The cubic root of 108989891 is about 477.6708502955.

The spelling of 108989891 in words is "one hundred eight million, nine hundred eighty-nine thousand, eight hundred ninety-one".