111123222181 has 2 divisors, whose sum is σ = 111123222182. Its totient is φ = 111123222180.

The previous prime is 111123222169. The next prime is 111123222241. The reversal of 111123222181 is 181222321111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110479788225 + 643433956 = 332385^2 + 25366^2 .

It is a cyclic number.

It is not a de Polignac number, because 111123222181 - 2⁵ = 111123222149 is a prime.

It is a super-2 number, since 2×111123222181² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111123222481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55561611090 + 55561611091.

It is an arithmetic number, because the mean of its divisors is an integer number (55561611091).

Almost surely, 2^111123222181 is an apocalyptic number.

It is an amenable number.

111123222181 is a deficient number, since it is larger than the sum of its proper divisors (1).

111123222181 is an equidigital number, since it uses as much as digits as its factorization.

111123222181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 384, while the sum is 25.

Adding to 111123222181 its reverse (181222321111), we get a palindrome (292345543292).

The spelling of 111123222181 in words is "one hundred eleven billion, one hundred twenty-three million, two hundred twenty-two thousand, one hundred eighty-one".