111366109 has 2 divisors, whose sum is σ = 111366110. Its totient is φ = 111366108.

The previous prime is 111366097. The next prime is 111366137. The reversal of 111366109 is 901663111.

111366109 = T₈₆₁₅ + T₈₆₁₆ + T₈₆₁₇.

It is an a-pointer prime, because the next prime (111366137) can be obtained adding 111366109 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74338884 + 37027225 = 8622^2 + 6085^2 .

It is a cyclic number.

It is not a de Polignac number, because 111366109 - 2¹¹ = 111364061 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111366139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55683054 + 55683055.

It is an arithmetic number, because the mean of its divisors is an integer number (55683055).

Almost surely, 2^111366109 is an apocalyptic number.

111366109 is the 8617-th centered triangular number.

It is an amenable number.

111366109 is a deficient number, since it is larger than the sum of its proper divisors (1).

111366109 is an equidigital number, since it uses as much as digits as its factorization.

111366109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 111366109 is about 10553.0142139580. The cubic root of 111366109 is about 481.1173463808.

The spelling of 111366109 in words is "one hundred eleven million, three hundred sixty-six thousand, one hundred nine".