111121112009 has 2 divisors, whose sum is σ = 111121112010. Its totient is φ = 111121112008.

The previous prime is 111121111991. The next prime is 111121112027. The reversal of 111121112009 is 900211121111.

It is a balanced prime because it is at equal distance from previous prime (111121111991) and next prime (111121112027).

It can be written as a sum of positive squares in only one way, i.e., 93389526409 + 17731585600 = 305597^2 + 133160^2 .

It is a cyclic number.

It is not a de Polignac number, because 111121112009 - 2³² = 106826144713 is a prime.

It is not a weakly prime, because it can be changed into another prime (111121112059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55560556004 + 55560556005.

It is an arithmetic number, because the mean of its divisors is an integer number (55560556005).

Almost surely, 2^111121112009 is an apocalyptic number.

It is an amenable number.

111121112009 is a deficient number, since it is larger than the sum of its proper divisors (1).

111121112009 is an equidigital number, since it uses as much as digits as its factorization.

111121112009 is an odious number, because the sum of its binary digits is odd.

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

The spelling of 111121112009 in words is "one hundred eleven billion, one hundred twenty-one million, one hundred twelve thousand, nine".