1091009109 has 16 divisors (see below), whose sum is σ = 1461240000. Its totient is φ = 724068096.

The previous prime is 1091009093. The next prime is 1091009147. The reversal of 1091009109 is 9019001901.

It is not a de Polignac number, because 1091009109 - 2⁴ = 1091009093 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091009189) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 887107 + ... + 888335.

It is an arithmetic number, because the mean of its divisors is an integer number (91327500).

Almost surely, 2^1091009109 is an apocalyptic number.

It is an amenable number.

1091009109 is a deficient number, since it is larger than the sum of its proper divisors (370230891).

1091009109 is a wasteful number, since it uses less digits than its factorization.

1091009109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2324.

The product of its (nonzero) digits is 729, while the sum is 30.

The square root of 1091009109 is about 33030.4270181298. The cubic root of 1091009109 is about 1029.4599578889.

The spelling of 1091009109 in words is "one billion, ninety-one million, nine thousand, one hundred nine".