111541817 has 2 divisors, whose sum is σ = 111541818. Its totient is φ = 111541816.

The previous prime is 111541783. The next prime is 111541819. The reversal of 111541817 is 718145111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110334016 + 1207801 = 10504^2 + 1099^2 .

It is an emirp because it is prime and its reverse (718145111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111541817 - 2⁶ = 111541753 is a prime.

It is a super-2 number, since 2×111541817² = 24883153879322978, which contains 22 as substring.

Together with 111541819, 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 111541817.

It is not a weakly prime, because it can be changed into another prime (111541819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55770908 + 55770909.

It is an arithmetic number, because the mean of its divisors is an integer number (55770909).

Almost surely, 2^111541817 is an apocalyptic number.

It is an amenable number.

111541817 is a deficient number, since it is larger than the sum of its proper divisors (1).

111541817 is an equidigital number, since it uses as much as digits as its factorization.

111541817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1120, while the sum is 29.

The square root of 111541817 is about 10561.3359476915. The cubic root of 111541817 is about 481.3702412318.

Adding to 111541817 its reverse (718145111), we get a palindrome (829686928).

The spelling of 111541817 in words is "one hundred eleven million, five hundred forty-one thousand, eight hundred seventeen".