12022181 has 2 divisors, whose sum is σ = 12022182. Its totient is φ = 12022180.

The previous prime is 12022159. The next prime is 12022223. The reversal of 12022181 is 18122021.

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., 12013156 + 9025 = 3466^2 + 95^2 .

It is an emirp because it is prime and its reverse (18122021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12022181 - 2¹⁸ = 11760037 is a prime.

It is a super-2 number, since 2×12022181² = 289065671993522, 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 (12022081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6011090 + 6011091.

It is an arithmetic number, because the mean of its divisors is an integer number (6011091).

Almost surely, 2^12022181 is an apocalyptic number.

It is an amenable number.

12022181 is a deficient number, since it is larger than the sum of its proper divisors (1).

12022181 is an equidigital number, since it uses as much as digits as its factorization.

12022181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 12022181 is about 3467.3016886334. The cubic root of 12022181 is about 229.0838222792.

The spelling of 12022181 in words is "twelve million, twenty-two thousand, one hundred eighty-one".