198066389 has 2 divisors, whose sum is σ = 198066390. Its totient is φ = 198066388.

The previous prime is 198066383. The next prime is 198066397. The reversal of 198066389 is 983660891.

198066389 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142683025 + 55383364 = 11945^2 + 7442^2 .

It is an emirp because it is prime and its reverse (983660891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198066389 - 2⁴ = 198066373 is a prime.

It is a super-4 number, since 4×198066389⁴ (a number of 34 digits) contains 4444 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198066383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99033194 + 99033195.

It is an arithmetic number, because the mean of its divisors is an integer number (99033195).

Almost surely, 2^198066389 is an apocalyptic number.

It is an amenable number.

198066389 is a deficient number, since it is larger than the sum of its proper divisors (1).

198066389 is an equidigital number, since it uses as much as digits as its factorization.

198066389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 559872, while the sum is 50.

The square root of 198066389 is about 14073.6061121519. The cubic root of 198066389 is about 582.9128035944.

The spelling of 198066389 in words is "one hundred ninety-eight million, sixty-six thousand, three hundred eighty-nine".