165284209 has 4 divisors (see below), whose sum is σ = 165346020. Its totient is φ = 165222400.

The previous prime is 165284159. The next prime is 165284257. The reversal of 165284209 is 902482561.

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 76038400 + 89245809 = 8720^2 + 9447^2 .

It is a cyclic number.

It is not a de Polignac number, because 165284209 - 2¹⁷ = 165153137 is a prime.

It is a super-3 number, since 3×165284209³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165284299) 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 in 3 ways as a sum of consecutive naturals, for example, 26704 + ... + 32305.

It is an arithmetic number, because the mean of its divisors is an integer number (41336505).

Almost surely, 2^165284209 is an apocalyptic number.

It is an amenable number.

165284209 is a deficient number, since it is larger than the sum of its proper divisors (61811).

165284209 is an equidigital number, since it uses as much as digits as its factorization.

165284209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61810.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 165284209 is about 12856.2906392163. The cubic root of 165284209 is about 548.7953900358.

The spelling of 165284209 in words is "one hundred sixty-five million, two hundred eighty-four thousand, two hundred nine".