11111202109 has 16 divisors (see below), whose sum is σ = 13379891200. Its totient is φ = 9013834224.

The previous prime is 11111202073. The next prime is 11111202121. The reversal of 11111202109 is 90120211111.

It is a cyclic number.

It is not a de Polignac number, because 11111202109 - 2¹⁹ = 11110677821 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111202139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97984 + ... + 178390.

It is an arithmetic number, because the mean of its divisors is an integer number (836243200).

Almost surely, 2^11111202109 is an apocalyptic number.

11111202109 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

11111202109 is a deficient number, since it is larger than the sum of its proper divisors (2268689091).

11111202109 is a wasteful number, since it uses less digits than its factorization.

11111202109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81472.

The product of its (nonzero) digits is 36, while the sum is 19.

The spelling of 11111202109 in words is "eleven billion, one hundred eleven million, two hundred two thousand, one hundred nine".