108203989 has 2 divisors, whose sum is σ = 108203990. Its totient is φ = 108203988.

The previous prime is 108203987. The next prime is 108204007. The reversal of 108203989 is 989302801.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99400900 + 8803089 = 9970^2 + 2967^2 .

It is an emirp because it is prime and its reverse (989302801) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 108203989 - 2¹ = 108203987 is a prime.

Together with 108203987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (108203987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54101994 + 54101995.

It is an arithmetic number, because the mean of its divisors is an integer number (54101995).

Almost surely, 2^108203989 is an apocalyptic number.

It is an amenable number.

108203989 is a deficient number, since it is larger than the sum of its proper divisors (1).

108203989 is an equidigital number, since it uses as much as digits as its factorization.

108203989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 108203989 is about 10402.1146407834. The cubic root of 108203989 is about 476.5199532719.

The spelling of 108203989 in words is "one hundred eight million, two hundred three thousand, nine hundred eighty-nine".