111506909 has 2 divisors, whose sum is σ = 111506910. Its totient is φ = 111506908.

The previous prime is 111506887. The next prime is 111506911. The reversal of 111506909 is 909605111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78765625 + 32741284 = 8875^2 + 5722^2 .

It is a cyclic number.

It is not a de Polignac number, because 111506909 - 2²⁴ = 94729693 is a prime.

Together with 111506911, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111506309) 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, 55753454 + 55753455.

It is an arithmetic number, because the mean of its divisors is an integer number (55753455).

Almost surely, 2^111506909 is an apocalyptic number.

It is an amenable number.

111506909 is a deficient number, since it is larger than the sum of its proper divisors (1).

111506909 is an equidigital number, since it uses as much as digits as its factorization.

111506909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2430, while the sum is 32.

The square root of 111506909 is about 10559.6831865355. The cubic root of 111506909 is about 481.3200196315.

The spelling of 111506909 in words is "one hundred eleven million, five hundred six thousand, nine hundred nine".