165008209 has 4 divisors (see below), whose sum is σ = 165041316. Its totient is φ = 164975104.

The previous prime is 165008183. The next prime is 165008227. The reversal of 165008209 is 902800561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 41731600 + 123276609 = 6460^2 + 11103^2 .

It is a cyclic number.

It is not a de Polignac number, because 165008209 - 2²⁷ = 30790481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165008269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7384 + ... + 19609.

It is an arithmetic number, because the mean of its divisors is an integer number (41260329).

Almost surely, 2^165008209 is an apocalyptic number.

It is an amenable number.

165008209 is a deficient number, since it is larger than the sum of its proper divisors (33107).

165008209 is an equidigital number, since it uses as much as digits as its factorization.

165008209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33106.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 165008209 is about 12845.5521095825. The cubic root of 165008209 is about 548.4897510070.

The spelling of 165008209 in words is "one hundred sixty-five million, eight thousand, two hundred nine".