113221181 has 2 divisors, whose sum is σ = 113221182. Its totient is φ = 113221180.

The previous prime is 113221127. The next prime is 113221201. The reversal of 113221181 is 181122311.

It is a happy number.

It is an a-pointer prime, because the next prime (113221201) can be obtained adding 113221181 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60062500 + 53158681 = 7750^2 + 7291^2 .

It is an emirp because it is prime and its reverse (181122311) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 113221181 - 2¹⁸ = 112959037 is a prime.

It is a super-2 number, since 2×113221181² = 25638071654069522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (113221781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56610590 + 56610591.

It is an arithmetic number, because the mean of its divisors is an integer number (56610591).

Almost surely, 2^113221181 is an apocalyptic number.

It is an amenable number.

113221181 is a deficient number, since it is larger than the sum of its proper divisors (1).

113221181 is an equidigital number, since it uses as much as digits as its factorization.

113221181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96, while the sum is 20.

The square root of 113221181 is about 10640.5442060075. The cubic root of 113221181 is about 483.7740404739.

Adding to 113221181 its reverse (181122311), we get a palindrome (294343492).

The spelling of 113221181 in words is "one hundred thirteen million, two hundred twenty-one thousand, one hundred eighty-one".