198180617 has 2 divisors, whose sum is σ = 198180618. Its totient is φ = 198180616.

The previous prime is 198180571. The next prime is 198180637. The reversal of 198180617 is 716081891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 164121721 + 34058896 = 12811^2 + 5836^2 .

It is a cyclic number.

It is not a de Polignac number, because 198180617 - 2⁶ = 198180553 is a prime.

It is not a weakly prime, because it can be changed into another prime (198180637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99090308 + 99090309.

It is an arithmetic number, because the mean of its divisors is an integer number (99090309).

Almost surely, 2^198180617 is an apocalyptic number.

It is an amenable number.

198180617 is a deficient number, since it is larger than the sum of its proper divisors (1).

198180617 is an equidigital number, since it uses as much as digits as its factorization.

198180617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 41.

The square root of 198180617 is about 14077.6637621446. The cubic root of 198180617 is about 583.0248403849.

The spelling of 198180617 in words is "one hundred ninety-eight million, one hundred eighty thousand, six hundred seventeen".