111121311181 has 2 divisors, whose sum is σ = 111121311182. Its totient is φ = 111121311180.

The previous prime is 111121311151. The next prime is 111121311221. The reversal of 111121311181 is 181113121111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57929269225 + 53192041956 = 240685^2 + 230634^2 .

It is a cyclic number.

It is not a de Polignac number, because 111121311181 - 2⁵ = 111121311149 is a prime.

It is a super-2 number, since 2×111121311181² (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 (111121311151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55560655590 + 55560655591.

It is an arithmetic number, because the mean of its divisors is an integer number (55560655591).

Almost surely, 2^111121311181 is an apocalyptic number.

It is an amenable number.

111121311181 is a deficient number, since it is larger than the sum of its proper divisors (1).

111121311181 is an equidigital number, since it uses as much as digits as its factorization.

111121311181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48, while the sum is 22.

Adding to 111121311181 its reverse (181113121111), we get a palindrome (292234432292).

The spelling of 111121311181 in words is "one hundred eleven billion, one hundred twenty-one million, three hundred eleven thousand, one hundred eighty-one".