165216313 has 4 divisors (see below), whose sum is σ = 165258468. Its totient is φ = 165174160.

The previous prime is 165216287. The next prime is 165216349. The reversal of 165216313 is 313612561.

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 117440569 + 47775744 = 10837^2 + 6912^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165216313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165216113) 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, 14518 + ... + 23263.

It is an arithmetic number, because the mean of its divisors is an integer number (41314617).

Almost surely, 2^165216313 is an apocalyptic number.

It is an amenable number.

165216313 is a deficient number, since it is larger than the sum of its proper divisors (42155).

165216313 is an equidigital number, since it uses as much as digits as its factorization.

165216313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42154.

The product of its digits is 3240, while the sum is 28.

The square root of 165216313 is about 12853.6497929576. The cubic root of 165216313 is about 548.7202344089.

Adding to 165216313 its reverse (313612561), we get a palindrome (478828874).

The spelling of 165216313 in words is "one hundred sixty-five million, two hundred sixteen thousand, three hundred thirteen".