111968009 has 2 divisors, whose sum is σ = 111968010. Its totient is φ = 111968008.

The previous prime is 111967997. The next prime is 111968011. The reversal of 111968009 is 900869111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87366409 + 24601600 = 9347^2 + 4960^2 .

It is a cyclic number.

It is not a de Polignac number, because 111968009 - 2¹² = 111963913 is a prime.

Together with 111968011, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111968009.

It is not a weakly prime, because it can be changed into another prime (111968099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55984004 + 55984005.

It is an arithmetic number, because the mean of its divisors is an integer number (55984005).

Almost surely, 2^111968009 is an apocalyptic number.

It is an amenable number.

111968009 is a deficient number, since it is larger than the sum of its proper divisors (1).

111968009 is an equidigital number, since it uses as much as digits as its factorization.

111968009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 35.

The square root of 111968009 is about 10581.4937036318. The cubic root of 111968009 is about 481.9825539044.

The spelling of 111968009 in words is "one hundred eleven million, nine hundred sixty-eight thousand, nine".