111162221 has 2 divisors, whose sum is σ = 111162222. Its totient is φ = 111162220.

The previous prime is 111162209. The next prime is 111162223. The reversal of 111162221 is 122261111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80802121 + 30360100 = 8989^2 + 5510^2 .

It is a cyclic number.

It is not a de Polignac number, because 111162221 - 2¹⁸ = 110900077 is a prime.

Together with 111162223, 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 111162221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111162223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55581110 + 55581111.

It is an arithmetic number, because the mean of its divisors is an integer number (55581111).

Almost surely, 2^111162221 is an apocalyptic number.

It is an amenable number.

111162221 is a deficient number, since it is larger than the sum of its proper divisors (1).

111162221 is an equidigital number, since it uses as much as digits as its factorization.

111162221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48, while the sum is 17.

The square root of 111162221 is about 10543.3496100623. The cubic root of 111162221 is about 480.8235586849.

The spelling of 111162221 in words is "one hundred eleven million, one hundred sixty-two thousand, two hundred twenty-one".