11111131209 has 16 divisors (see below), whose sum is σ = 15148505088. Its totient is φ = 7240973712.

The previous prime is 11111131189. The next prime is 11111131211. The reversal of 11111131209 is 90213111111.

It is not a de Polignac number, because 11111131209 - 2⁵ = 11111131177 is a prime.

It is a super-2 number, since 2×11111131209² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11111131289) 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, 68964 + ... + 164250.

It is an arithmetic number, because the mean of its divisors is an integer number (946781568).

Almost surely, 2^11111131209 is an apocalyptic number.

It is an amenable number.

11111131209 is a deficient number, since it is larger than the sum of its proper divisors (4037373879).

11111131209 is an equidigital number, since it uses as much as digits as its factorization.

11111131209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96164.

The product of its (nonzero) digits is 54, while the sum is 21.

The spelling of 11111131209 in words is "eleven billion, one hundred eleven million, one hundred thirty-one thousand, two hundred nine".