165159193 has 4 divisors (see below), whose sum is σ = 169187508. Its totient is φ = 161130880.

The previous prime is 165159149. The next prime is 165159209. The reversal of 165159193 is 391951561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 391951561 = 269 ⋅1457069.

It can be written as a sum of positive squares in 2 ways, for example, as 4173849 + 160985344 = 2043^2 + 12688^2 .

It is a cyclic number.

It is not a de Polignac number, because 165159193 - 2⁹ = 165158681 is a prime.

It is a super-2 number, since 2×165159193² = 54555118064822498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165159793) by changing a digit.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2014096 + ... + 2014177.

It is an arithmetic number, because the mean of its divisors is an integer number (42296877).

Almost surely, 2^165159193 is an apocalyptic number.

It is an amenable number.

165159193 is a deficient number, since it is larger than the sum of its proper divisors (4028315).

165159193 is an equidigital number, since it uses as much as digits as its factorization.

165159193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4028314.

The product of its digits is 36450, while the sum is 40.

The square root of 165159193 is about 12851.4276638823. The cubic root of 165159193 is about 548.6569910322.

The spelling of 165159193 in words is "one hundred sixty-five million, one hundred fifty-nine thousand, one hundred ninety-three".