165120313 has 4 divisors (see below), whose sum is σ = 165449088. Its totient is φ = 164791540.

The previous prime is 165120311. The next prime is 165120323. The reversal of 165120313 is 313021561.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 165120313 - 2¹ = 165120311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165120311) 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, 163633 + ... + 164638.

It is an arithmetic number, because the mean of its divisors is an integer number (41362272).

Almost surely, 2^165120313 is an apocalyptic number.

It is an amenable number.

165120313 is a deficient number, since it is larger than the sum of its proper divisors (328775).

165120313 is an equidigital number, since it uses as much as digits as its factorization.

165120313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328774.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 165120313 is about 12849.9149024420. The cubic root of 165120313 is about 548.6139346785.

Adding to 165120313 its reverse (313021561), we get a palindrome (478141874).

The spelling of 165120313 in words is "one hundred sixty-five million, one hundred twenty thousand, three hundred thirteen".