109188989 has 8 divisors (see below), whose sum is σ = 134386560. Its totient is φ = 86391216.

The previous prime is 109188971. The next prime is 109189001. The reversal of 109188989 is 989881901.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 109188989 - 2⁸ = 109188733 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 109188989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109188949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 599849 + ... + 600030.

It is an arithmetic number, because the mean of its divisors is an integer number (16798320).

Almost surely, 2^109188989 is an apocalyptic number.

It is an amenable number.

109188989 is a deficient number, since it is larger than the sum of its proper divisors (25197571).

109188989 is a wasteful number, since it uses less digits than its factorization.

109188989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1199899.

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

The square root of 109188989 is about 10449.3535206729. The cubic root of 109188989 is about 477.9615361521.

The spelling of 109188989 in words is "one hundred nine million, one hundred eighty-eight thousand, nine hundred eighty-nine".