111222111109 has 2 divisors, whose sum is σ = 111222111110. Its totient is φ = 111222111108.

The previous prime is 111222111107. The next prime is 111222111113. The reversal of 111222111109 is 901111222111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85291450209 + 25930660900 = 292047^2 + 161030^2 .

It is an emirp because it is prime and its reverse (901111222111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111222111109 - 2¹ = 111222111107 is a prime.

Together with 111222111107, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 111222111109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111222111107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55611055554 + 55611055555.

It is an arithmetic number, because the mean of its divisors is an integer number (55611055555).

Almost surely, 2^111222111109 is an apocalyptic number.

It is an amenable number.

111222111109 is a deficient number, since it is larger than the sum of its proper divisors (1).

111222111109 is an equidigital number, since it uses as much as digits as its factorization.

111222111109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 22.

The spelling of 111222111109 in words is "one hundred eleven billion, two hundred twenty-two million, one hundred eleven thousand, one hundred nine".