198404653 has 2 divisors, whose sum is σ = 198404654. Its totient is φ = 198404652.

The previous prime is 198404651. The next prime is 198404659. The reversal of 198404653 is 356404891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125507209 + 72897444 = 11203^2 + 8538^2 .

It is an emirp because it is prime and its reverse (356404891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198404653 - 2¹ = 198404651 is a prime.

Together with 198404651, 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 (198404651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99202326 + 99202327.

It is an arithmetic number, because the mean of its divisors is an integer number (99202327).

Almost surely, 2^198404653 is an apocalyptic number.

It is an amenable number.

198404653 is a deficient number, since it is larger than the sum of its proper divisors (1).

198404653 is an equidigital number, since it uses as much as digits as its factorization.

198404653 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 198404653 is about 14085.6186587597. The cubic root of 198404653 is about 583.2444537964.

The spelling of 198404653 in words is "one hundred ninety-eight million, four hundred four thousand, six hundred fifty-three".