1109509729 has 2 divisors, whose sum is σ = 1109509730. Its totient is φ = 1109509728.

The previous prime is 1109509727. The next prime is 1109509759. The reversal of 1109509729 is 9279059011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 739024225 + 370485504 = 27185^2 + 19248^2 .

It is a cyclic number.

It is not a de Polignac number, because 1109509729 - 2¹ = 1109509727 is a prime.

Together with 1109509727, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1109509727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 554754864 + 554754865.

It is an arithmetic number, because the mean of its divisors is an integer number (554754865).

Almost surely, 2^1109509729 is an apocalyptic number.

It is an amenable number.

1109509729 is a deficient number, since it is larger than the sum of its proper divisors (1).

1109509729 is an equidigital number, since it uses as much as digits as its factorization.

1109509729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51030, while the sum is 43.

The square root of 1109509729 is about 33309.3039404909. The cubic root of 1109509729 is about 1035.2463427568.

The spelling of 1109509729 in words is "one billion, one hundred nine million, five hundred nine thousand, seven hundred twenty-nine".