1091133109 has 12 divisors (see below), whose sum is σ = 1207413900. Its totient is φ = 985265600.

The previous prime is 1091133107. The next prime is 1091133139. The reversal of 1091133109 is 9013311901.

It can be written as a sum of positive squares in 2 ways, for example, as 145878084 + 945255025 = 12078^2 + 30745^2 .

It is not a de Polignac number, because 1091133109 - 2¹ = 1091133107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091133107) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12232 + ... + 48289.

It is an arithmetic number, because the mean of its divisors is an integer number (100617825).

Almost surely, 2^1091133109 is an apocalyptic number.

It is an amenable number.

1091133109 is a deficient number, since it is larger than the sum of its proper divisors (116280791).

1091133109 is a wasteful number, since it uses less digits than its factorization.

1091133109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60692 (or 60681 counting only the distinct ones).

The product of its (nonzero) digits is 729, while the sum is 28.

The square root of 1091133109 is about 33032.3040219722. The cubic root of 1091133109 is about 1029.4989579296.

It can be divided in two parts, 10 and 91133109, that added together give a palindrome (91133119).

The spelling of 1091133109 in words is "one billion, ninety-one million, one hundred thirty-three thousand, one hundred nine".