113221231181 has 2 divisors, whose sum is σ = 113221231182. Its totient is φ = 113221231180.

The previous prime is 113221231171. The next prime is 113221231219. The reversal of 113221231181 is 181132122311.

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., 99534571081 + 13686660100 = 315491^2 + 116990^2 .

It is a cyclic number.

It is not a de Polignac number, because 113221231181 - 2²⁶ = 113154122317 is a prime.

It is a super-2 number, since 2×113221231181² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 113221231181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (113221231171) 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, 56610615590 + 56610615591.

It is an arithmetic number, because the mean of its divisors is an integer number (56610615591).

Almost surely, 2^113221231181 is an apocalyptic number.

It is an amenable number.

113221231181 is a deficient number, since it is larger than the sum of its proper divisors (1).

113221231181 is an equidigital number, since it uses as much as digits as its factorization.

113221231181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 26.

Adding to 113221231181 its reverse (181132122311), we get a palindrome (294353353492).

The spelling of 113221231181 in words is "one hundred thirteen billion, two hundred twenty-one million, two hundred thirty-one thousand, one hundred eighty-one".