111192721 has 2 divisors, whose sum is σ = 111192722. Its totient is φ = 111192720.

The previous prime is 111192709. The next prime is 111192727. The reversal of 111192721 is 127291111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 106193025 + 4999696 = 10305^2 + 2236^2 .

It is an emirp because it is prime and its reverse (127291111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111192721 - 2⁵ = 111192689 is a prime.

It is not a weakly prime, because it can be changed into another prime (111192727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55596360 + 55596361.

It is an arithmetic number, because the mean of its divisors is an integer number (55596361).

Almost surely, 2^111192721 is an apocalyptic number.

It is an amenable number.

111192721 is a deficient number, since it is larger than the sum of its proper divisors (1).

111192721 is an equidigital number, since it uses as much as digits as its factorization.

111192721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 252, while the sum is 25.

The square root of 111192721 is about 10544.7959202632. The cubic root of 111192721 is about 480.8675297912.

The spelling of 111192721 in words is "one hundred eleven million, one hundred ninety-two thousand, seven hundred twenty-one".