198105653 has 2 divisors, whose sum is σ = 198105654. Its totient is φ = 198105652.

The previous prime is 198105617. The next prime is 198105671. The reversal of 198105653 is 356501891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 144552529 + 53553124 = 12023^2 + 7318^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198105653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198105683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99052826 + 99052827.

It is an arithmetic number, because the mean of its divisors is an integer number (99052827).

Almost surely, 2^198105653 is an apocalyptic number.

It is an amenable number.

198105653 is a deficient number, since it is larger than the sum of its proper divisors (1).

198105653 is an equidigital number, since it uses as much as digits as its factorization.

198105653 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 38.

The square root of 198105653 is about 14075.0009946714. Note that the first 3 decimals coincide. The cubic root of 198105653 is about 582.9513192594.

The spelling of 198105653 in words is "one hundred ninety-eight million, one hundred five thousand, six hundred fifty-three".