1109091011 has 4 divisors (see below), whose sum is σ = 1267532592. Its totient is φ = 950649432.

The previous prime is 1109090989. The next prime is 1109091031. The reversal of 1109091011 is 1101909011.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1109091011 - 2³⁰ = 35349187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1109091031) 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, 79220780 + ... + 79220793.

It is an arithmetic number, because the mean of its divisors is an integer number (316883148).

Almost surely, 2^1109091011 is an apocalyptic number.

1109091011 is a deficient number, since it is larger than the sum of its proper divisors (158441581).

1109091011 is an equidigital number, since it uses as much as digits as its factorization.

1109091011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158441580.

The product of its (nonzero) digits is 81, while the sum is 23.

The square root of 1109091011 is about 33303.0180464174. The cubic root of 1109091011 is about 1035.1160957933.

It can be divided in two parts, 11090910 and 11, that multiplied together give a triangular number (122000010 = T₁₅₆₂₀).

The spelling of 1109091011 in words is "one billion, one hundred nine million, ninety-one thousand, eleven".