1111111111009 has 8 divisors (see below), whose sum is σ = 1126478432808. Its totient is φ = 1095829401600.

The previous prime is 1111111110971. The next prime is 1111111111049. The reversal of 1111111111009 is 9001111111111.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 981381478609 + 129729632400 = 990647^2 + 360180^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1111111111009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1111111111049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21376962 + ... + 21428875.

It is an arithmetic number, because the mean of its divisors is an integer number (140809804101).

Almost surely, 2^{1111111111009} is an apocalyptic number.

It is an amenable number.

1111111111009 is a deficient number, since it is larger than the sum of its proper divisors (15367321799).

1111111111009 is a wasteful number, since it uses less digits than its factorization.

1111111111009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42806195.

The product of its (nonzero) digits is 9, while the sum is 19.

The spelling of 1111111111009 in words is "one trillion, one hundred eleven billion, one hundred eleven million, one hundred eleven thousand, nine".