1109091121 has 4 divisors (see below), whose sum is σ = 1109197312. Its totient is φ = 1108984932.

The previous prime is 1109091107. The next prime is 1109091163. The reversal of 1109091121 is 1211909011.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1109091121 - 2⁵ = 1109091089 is a prime.

It is a super-2 number, since 2×1109091121² = 2460166229362073282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1109091521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35481 + ... + 58966.

It is an arithmetic number, because the mean of its divisors is an integer number (277299328).

Almost surely, 2^1109091121 is an apocalyptic number.

It is an amenable number.

1109091121 is a deficient number, since it is larger than the sum of its proper divisors (106191).

1109091121 is an equidigital number, since it uses as much as digits as its factorization.

1109091121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106190.

The product of its (nonzero) digits is 162, while the sum is 25.

The square root of 1109091121 is about 33303.0196979193. The cubic root of 1109091121 is about 1035.1161300143.

The spelling of 1109091121 in words is "one billion, one hundred nine million, ninety-one thousand, one hundred twenty-one".