11111111109 has 48 divisors (see below), whose sum is σ = 18966764544. Its totient is φ = 6133708800.

The previous prime is 11111111059. The next prime is 11111111113. The reversal of 11111111109 is 90111111111.

It is not a de Polignac number, because 11111111109 - 2¹⁹ = 11110586821 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11111111091 and 11111111100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111111129) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1192549 + ... + 1201829.

It is an arithmetic number, because the mean of its divisors is an integer number (395140928).

Almost surely, 2^11111111109 is an apocalyptic number.

It is an amenable number.

11111111109 is a deficient number, since it is larger than the sum of its proper divisors (7855653435).

11111111109 is a wasteful number, since it uses less digits than its factorization.

11111111109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9938 (or 9935 counting only the distinct ones).

The product of its (nonzero) digits is 9, while the sum is 18.

The spelling of 11111111109 in words is "eleven billion, one hundred eleven million, one hundred eleven thousand, one hundred nine".