198636161 has 2 divisors, whose sum is σ = 198636162. Its totient is φ = 198636160.

The previous prime is 198636101. The next prime is 198636199. The reversal of 198636161 is 161636891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 175297600 + 23338561 = 13240^2 + 4831^2 .

It is a cyclic number.

It is not a de Polignac number, because 198636161 - 2¹⁰ = 198635137 is a prime.

It is not a weakly prime, because it can be changed into another prime (198636101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99318080 + 99318081.

It is an arithmetic number, because the mean of its divisors is an integer number (99318081).

Almost surely, 2^198636161 is an apocalyptic number.

It is an amenable number.

198636161 is a deficient number, since it is larger than the sum of its proper divisors (1).

198636161 is an equidigital number, since it uses as much as digits as its factorization.

198636161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 41.

The square root of 198636161 is about 14093.8341483075. The cubic root of 198636161 is about 583.4712180899.

The spelling of 198636161 in words is "one hundred ninety-eight million, six hundred thirty-six thousand, one hundred sixty-one".