22180889 has 2 divisors, whose sum is σ = 22180890. Its totient is φ = 22180888.

The previous prime is 22180859. The next prime is 22180927. The reversal of 22180889 is 98808122.

It is an a-pointer prime, because the next prime (22180927) can be obtained adding 22180889 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22165264 + 15625 = 4708^2 + 125^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22180889 is a prime.

It is a Chen prime.

It is equal to p_1399907 and since 22180889 and 1399907 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (22180859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11090444 + 11090445.

It is an arithmetic number, because the mean of its divisors is an integer number (11090445).

Almost surely, 2^22180889 is an apocalyptic number.

It is an amenable number.

22180889 is a deficient number, since it is larger than the sum of its proper divisors (1).

22180889 is an equidigital number, since it uses as much as digits as its factorization.

22180889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18432, while the sum is 38.

The square root of 22180889 is about 4709.6591171761. The cubic root of 22180889 is about 280.9698046353.

The spelling of 22180889 in words is "twenty-two million, one hundred eighty thousand, eight hundred eighty-nine".