111955219 has 2 divisors, whose sum is σ = 111955220. Its totient is φ = 111955218.

The previous prime is 111955171. The next prime is 111955231. The reversal of 111955219 is 912559111.

It is a strong prime.

It is an emirp because it is prime and its reverse (912559111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111955219 - 2⁷ = 111955091 is a prime.

It is a super-2 number, since 2×111955219² = 25067942122675922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (111955279) 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, 55977609 + 55977610.

It is an arithmetic number, because the mean of its divisors is an integer number (55977610).

Almost surely, 2^111955219 is an apocalyptic number.

111955219 is a deficient number, since it is larger than the sum of its proper divisors (1).

111955219 is an equidigital number, since it uses as much as digits as its factorization.

111955219 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4050, while the sum is 34.

The square root of 111955219 is about 10580.8893293522. The cubic root of 111955219 is about 481.9642010682.

The spelling of 111955219 in words is "one hundred eleven million, nine hundred fifty-five thousand, two hundred nineteen".