165684313 has 4 divisors (see below), whose sum is σ = 174404560. Its totient is φ = 156964068.

The previous prime is 165684293. The next prime is 165684361. The reversal of 165684313 is 313486561.

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: 313486561 = 139 ⋅2255299.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165684313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165684373) 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, 4360095 + ... + 4360132.

It is an arithmetic number, because the mean of its divisors is an integer number (43601140).

Almost surely, 2^165684313 is an apocalyptic number.

It is an amenable number.

165684313 is a deficient number, since it is larger than the sum of its proper divisors (8720247).

165684313 is an equidigital number, since it uses as much as digits as its factorization.

165684313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8720246.

The product of its digits is 51840, while the sum is 37.

The square root of 165684313 is about 12871.8418650945. The cubic root of 165684313 is about 549.2378567712.

The spelling of 165684313 in words is "one hundred sixty-five million, six hundred eighty-four thousand, three hundred thirteen".