1111011111209 has 16 divisors (see below), whose sum is σ = 1238458279680. Its totient is φ = 990479197440.

The previous prime is 1111011111163. The next prime is 1111011111227. The reversal of 1111011111209 is 9021111101111.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1111011111209 - 2²⁸ = 1110742675753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1111011111269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2012087 + ... + 2504099.

It is an arithmetic number, because the mean of its divisors is an integer number (77403642480).

Almost surely, 2^{1111011111209} is an apocalyptic number.

1111011111209 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1111011111209 is a deficient number, since it is larger than the sum of its proper divisors (127447168471).

1111011111209 is a wasteful number, since it uses less digits than its factorization.

1111011111209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499040.

The product of its (nonzero) digits is 18, while the sum is 20.

The spelling of 1111011111209 in words is "one trillion, one hundred eleven billion, eleven million, one hundred eleven thousand, two hundred nine".