209147 has 2 divisors, whose sum is σ = 209148. Its totient is φ = 209146.

The previous prime is 209123. The next prime is 209159. The reversal of 209147 is 741902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 209147 - 2⁸ = 208891 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (209347) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104573 + 104574.

It is an arithmetic number, because the mean of its divisors is an integer number (104574).

2²⁰⁹¹⁴⁷ is an apocalyptic number.

209147 is a deficient number, since it is larger than the sum of its proper divisors (1).

209147 is an equidigital number, since it uses as much as digits as its factorization.

209147 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 209147 is about 457.3259231664. The cubic root of 209147 is about 59.3586314990.

The spelling of 209147 in words is "two hundred nine thousand, one hundred forty-seven".