111919 has 2 divisors, whose sum is σ = 111920. Its totient is φ = 111918.

The previous prime is 111913. The next prime is 111949. The reversal of 111919 is 919111.

It is a weak prime.

It is an emirp because it is prime and its reverse (919111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111919 - 2⁷ = 111791 is a prime.

It is a super-2 number, since 2×111919² = 25051725122, which contains 22 as substring.

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 111919.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111913) 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, 55959 + 55960.

It is an arithmetic number, because the mean of its divisors is an integer number (55960).

2¹¹¹⁹¹⁹ is an apocalyptic number.

111919 is a deficient number, since it is larger than the sum of its proper divisors (1).

111919 is an equidigital number, since it uses as much as digits as its factorization.

111919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81, while the sum is 22.

The square root of 111919 is about 334.5429718287. The cubic root of 111919 is about 48.1912221523.

The spelling of 111919 in words is "one hundred eleven thousand, nine hundred nineteen".