18213289 has 2 divisors, whose sum is σ = 18213290. Its totient is φ = 18213288.

The previous prime is 18213277. The next prime is 18213301. The reversal of 18213289 is 98231281.

It is a balanced prime because it is at equal distance from previous prime (18213277) and next prime (18213301).

It can be written as a sum of positive squares in only one way, i.e., 15210000 + 3003289 = 3900^2 + 1733^2 .

It is a cyclic number.

It is not a de Polignac number, because 18213289 - 2⁵ = 18213257 is a prime.

It is not a weakly prime, because it can be changed into another prime (18213889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9106644 + 9106645.

It is an arithmetic number, because the mean of its divisors is an integer number (9106645).

Almost surely, 2^18213289 is an apocalyptic number.

It is an amenable number.

18213289 is a deficient number, since it is larger than the sum of its proper divisors (1).

18213289 is an equidigital number, since it uses as much as digits as its factorization.

18213289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 34.

The square root of 18213289 is about 4267.7030121601. The cubic root of 18213289 is about 263.1052170005.

The spelling of 18213289 in words is "eighteen million, two hundred thirteen thousand, two hundred eighty-nine".