18922289 has 2 divisors, whose sum is σ = 18922290. Its totient is φ = 18922288.

The previous prime is 18922273. The next prime is 18922301. The reversal of 18922289 is 98222981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18879025 + 43264 = 4345^2 + 208^2 .

It is a cyclic number.

It is not a de Polignac number, because 18922289 - 2⁴ = 18922273 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18922489) 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, 9461144 + 9461145.

It is an arithmetic number, because the mean of its divisors is an integer number (9461145).

Almost surely, 2^18922289 is an apocalyptic number.

It is an amenable number.

18922289 is a deficient number, since it is larger than the sum of its proper divisors (1).

18922289 is an equidigital number, since it uses as much as digits as its factorization.

18922289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 41.

The square root of 18922289 is about 4349.9757470588. The cubic root of 18922289 is about 266.4758709866.

The spelling of 18922289 in words is "eighteen million, nine hundred twenty-two thousand, two hundred eighty-nine".