165219413 has 4 divisors (see below), whose sum is σ = 174938220. Its totient is φ = 155500608.

The previous prime is 165219407. The next prime is 165219433. The reversal of 165219413 is 314912561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 314912561 = 61 ⋅5162501.

It can be written as a sum of positive squares in 2 ways, for example, as 56580484 + 108638929 = 7522^2 + 10423^2 .

It is a cyclic number.

It is not a de Polignac number, because 165219413 - 2⁸ = 165219157 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 165219413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165219403) 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, 4859378 + ... + 4859411.

It is an arithmetic number, because the mean of its divisors is an integer number (43734555).

Almost surely, 2^165219413 is an apocalyptic number.

It is an amenable number.

165219413 is a deficient number, since it is larger than the sum of its proper divisors (9718807).

165219413 is an equidigital number, since it uses as much as digits as its factorization.

165219413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9718806.

The product of its digits is 6480, while the sum is 32.

The square root of 165219413 is about 12853.7703807093. The cubic root of 165219413 is about 548.7236663179.

The spelling of 165219413 in words is "one hundred sixty-five million, two hundred nineteen thousand, four hundred thirteen".