165049919 has 4 divisors (see below), whose sum is σ = 165075696. Its totient is φ = 165024144.

The previous prime is 165049901. The next prime is 165049931. The reversal of 165049919 is 919940561.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 165049919 - 2²⁴ = 148272703 is a prime.

It is a super-2 number, since 2×165049919² = 54482951523813122, which contains 22 as substring.

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 165049919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165049939) 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, 4907 + ... + 18819.

It is an arithmetic number, because the mean of its divisors is an integer number (41268924).

Almost surely, 2^165049919 is an apocalyptic number.

165049919 is a deficient number, since it is larger than the sum of its proper divisors (25777).

165049919 is a wasteful number, since it uses less digits than its factorization.

165049919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25776.

The product of its (nonzero) digits is 87480, while the sum is 44.

The square root of 165049919 is about 12847.1755261614. The cubic root of 165049919 is about 548.5359620012.

The spelling of 165049919 in words is "one hundred sixty-five million, forty-nine thousand, nine hundred nineteen".