2189181811 has 2 divisors, whose sum is σ = 2189181812. Its totient is φ = 2189181810.

The previous prime is 2189181809. The next prime is 2189181829. The reversal of 2189181811 is 1181819812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2189181811 - 2¹ = 2189181809 is a prime.

It is a super-2 number, since 2×2189181811² = 9585034003226479442, which contains 22 as substring.

Together with 2189181809, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2169181811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1094590905 + 1094590906.

It is an arithmetic number, because the mean of its divisors is an integer number (1094590906).

Almost surely, 2^2189181811 is an apocalyptic number.

2189181811 is a deficient number, since it is larger than the sum of its proper divisors (1).

2189181811 is an equidigital number, since it uses as much as digits as its factorization.

2189181811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 40.

The square root of 2189181811 is about 46788.6931961131. The cubic root of 2189181811 is about 1298.4561180970.

The spelling of 2189181811 in words is "two billion, one hundred eighty-nine million, one hundred eighty-one thousand, eight hundred eleven".