2189941181 has 2 divisors, whose sum is σ = 2189941182. Its totient is φ = 2189941180.

The previous prime is 2189941141. The next prime is 2189941183. The reversal of 2189941181 is 1811499812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1895818681 + 294122500 = 43541^2 + 17150^2 .

It is a cyclic number.

It is not a de Polignac number, because 2189941181 - 2²² = 2185746877 is a prime.

It is a super-2 number, since 2×2189941181² = 9591684752479349522, which contains 22 as substring.

Together with 2189941183, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2189941183) 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, 1094970590 + 1094970591.

It is an arithmetic number, because the mean of its divisors is an integer number (1094970591).

Almost surely, 2^2189941181 is an apocalyptic number.

It is an amenable number.

2189941181 is a deficient number, since it is larger than the sum of its proper divisors (1).

2189941181 is an equidigital number, since it uses as much as digits as its factorization.

2189941181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 44.

The square root of 2189941181 is about 46796.8073804186. The cubic root of 2189941181 is about 1298.6062342473.

The spelling of 2189941181 in words is "two billion, one hundred eighty-nine million, nine hundred forty-one thousand, one hundred eighty-one".