165009197 has 4 divisors (see below), whose sum is σ = 165045216. Its totient is φ = 164973180.

The previous prime is 165009161. The next prime is 165009211. The reversal of 165009197 is 791900561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 791900561 = 3253 ⋅243437.

It is a cyclic number.

It is not a de Polignac number, because 165009197 - 2¹⁴ = 164992813 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 165009197.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165003197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9929 + ... + 20702.

It is an arithmetic number, because the mean of its divisors is an integer number (41261304).

Almost surely, 2^165009197 is an apocalyptic number.

It is an amenable number.

165009197 is a deficient number, since it is larger than the sum of its proper divisors (36019).

165009197 is an equidigital number, since it uses as much as digits as its factorization.

165009197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36018.

The product of its (nonzero) digits is 17010, while the sum is 38.

The square root of 165009197 is about 12845.5905664162. The cubic root of 165009197 is about 548.4908457137.

The spelling of 165009197 in words is "one hundred sixty-five million, nine thousand, one hundred ninety-seven".