11111122109 has 2 divisors, whose sum is σ = 11111122110. Its totient is φ = 11111122108.

The previous prime is 11111122073. The next prime is 11111122117. The reversal of 11111122109 is 90122111111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8484252100 + 2626870009 = 92110^2 + 51253^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11111122109 is a prime.

It is a super-2 number, since 2×11111122109² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11111122129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555561054 + 5555561055.

It is an arithmetic number, because the mean of its divisors is an integer number (5555561055).

Almost surely, 2^11111122109 is an apocalyptic number.

It is an amenable number.

11111122109 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111122109 is an equidigital number, since it uses as much as digits as its factorization.

11111122109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 20.

The spelling of 11111122109 in words is "eleven billion, one hundred eleven million, one hundred twenty-two thousand, one hundred nine".