1109189091 has 4 divisors (see below), whose sum is σ = 1478918792. Its totient is φ = 739459392.

The previous prime is 1109189069. The next prime is 1109189093. The reversal of 1109189091 is 1909819011.

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

It is not a de Polignac number, because 1109189091 - 2¹⁴ = 1109172707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1109189093) 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, 184864846 + ... + 184864851.

It is an arithmetic number, because the mean of its divisors is an integer number (369729698).

Almost surely, 2^1109189091 is an apocalyptic number.

1109189091 is a deficient number, since it is larger than the sum of its proper divisors (369729701).

1109189091 is an equidigital number, since it uses as much as digits as its factorization.

1109189091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369729700.

The product of its (nonzero) digits is 5832, while the sum is 39.

The square root of 1109189091 is about 33304.4905530771. The cubic root of 1109189091 is about 1035.1466076248.

The spelling of 1109189091 in words is "one billion, one hundred nine million, one hundred eighty-nine thousand, ninety-one".