111944213 has 2 divisors, whose sum is σ = 111944214. Its totient is φ = 111944212.

The previous prime is 111944191. The next prime is 111944233. The reversal of 111944213 is 312449111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81396484 + 30547729 = 9022^2 + 5527^2 .

It is a cyclic number.

It is not a de Polignac number, because 111944213 - 2⁸ = 111943957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111944233) 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, 55972106 + 55972107.

It is an arithmetic number, because the mean of its divisors is an integer number (55972107).

Almost surely, 2^111944213 is an apocalyptic number.

It is an amenable number.

111944213 is a deficient number, since it is larger than the sum of its proper divisors (1).

111944213 is an equidigital number, since it uses as much as digits as its factorization.

111944213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 26.

The square root of 111944213 is about 10580.3692279618. The cubic root of 111944213 is about 481.9484070395.

The spelling of 111944213 in words is "one hundred eleven million, nine hundred forty-four thousand, two hundred thirteen".