218098789 has 2 divisors, whose sum is σ = 218098790. Its totient is φ = 218098788.

The previous prime is 218098717. The next prime is 218098817. The reversal of 218098789 is 987890812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196476289 + 21622500 = 14017^2 + 4650^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218098789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218093789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109049394 + 109049395.

It is an arithmetic number, because the mean of its divisors is an integer number (109049395).

Almost surely, 2^218098789 is an apocalyptic number.

It is an amenable number.

218098789 is a deficient number, since it is larger than the sum of its proper divisors (1).

218098789 is an equidigital number, since it uses as much as digits as its factorization.

218098789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 580608, while the sum is 52.

The square root of 218098789 is about 14768.1680989891. The cubic root of 218098789 is about 601.9370627316.

The spelling of 218098789 in words is "two hundred eighteen million, ninety-eight thousand, seven hundred eighty-nine".