165350209 has 2 divisors, whose sum is σ = 165350210. Its totient is φ = 165350208.

The previous prime is 165350191. The next prime is 165350219. The reversal of 165350209 is 902053561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130599184 + 34751025 = 11428^2 + 5895^2 .

It is an emirp because it is prime and its reverse (902053561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165350209 - 2¹⁷ = 165219137 is a prime.

It is not a weakly prime, because it can be changed into another prime (165350219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82675104 + 82675105.

It is an arithmetic number, because the mean of its divisors is an integer number (82675105).

Almost surely, 2^165350209 is an apocalyptic number.

It is an amenable number.

165350209 is a deficient number, since it is larger than the sum of its proper divisors (1).

165350209 is an equidigital number, since it uses as much as digits as its factorization.

165350209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 165350209 is about 12858.8572198310. The cubic root of 165350209 is about 548.8684272120.

The spelling of 165350209 in words is "one hundred sixty-five million, three hundred fifty thousand, two hundred nine".