209998163 has 2 divisors, whose sum is σ = 209998164. Its totient is φ = 209998162.

The previous prime is 209998157. The next prime is 209998189. The reversal of 209998163 is 361899902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 209998163 - 2⁴ = 209998147 is a prime.

It is not a weakly prime, because it can be changed into another prime (209998153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104999081 + 104999082.

It is an arithmetic number, because the mean of its divisors is an integer number (104999082).

Almost surely, 2^209998163 is an apocalyptic number.

209998163 is a deficient number, since it is larger than the sum of its proper divisors (1).

209998163 is an equidigital number, since it uses as much as digits as its factorization.

209998163 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 209952, while the sum is 47.

The square root of 209998163 is about 14491.3133635292. The cubic root of 209998163 is about 594.3904620991.

The spelling of 209998163 in words is "two hundred nine million, nine hundred ninety-eight thousand, one hundred sixty-three".