198084661 has 2 divisors, whose sum is σ = 198084662. Its totient is φ = 198084660.

The previous prime is 198084659. The next prime is 198084673. The reversal of 198084661 is 166480891.

198084661 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., 163686436 + 34398225 = 12794^2 + 5865^2 .

It is an emirp because it is prime and its reverse (166480891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198084661 - 2¹ = 198084659 is a prime.

Together with 198084659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198024661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99042330 + 99042331.

It is an arithmetic number, because the mean of its divisors is an integer number (99042331).

Almost surely, 2^198084661 is an apocalyptic number.

It is an amenable number.

198084661 is a deficient number, since it is larger than the sum of its proper divisors (1).

198084661 is an equidigital number, since it uses as much as digits as its factorization.

198084661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 198084661 is about 14074.2552556077. The cubic root of 198084661 is about 582.9307279804.

The spelling of 198084661 in words is "one hundred ninety-eight million, eighty-four thousand, six hundred sixty-one".