165248321 has 16 divisors (see below), whose sum is σ = 198266880. Its totient is φ = 134738640.

The previous prime is 165248299. The next prime is 165248323. The reversal of 165248321 is 123842561.

It is a cyclic number.

It is not a de Polignac number, because 165248321 - 2⁶ = 165248257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165248323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6350 + ... + 19256.

It is an arithmetic number, because the mean of its divisors is an integer number (12391680).

Almost surely, 2^165248321 is an apocalyptic number.

It is an amenable number.

165248321 is a deficient number, since it is larger than the sum of its proper divisors (33018559).

165248321 is a wasteful number, since it uses less digits than its factorization.

165248321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13004.

The product of its digits is 11520, while the sum is 32.

The square root of 165248321 is about 12854.8948264854. The cubic root of 165248321 is about 548.7556673571.

The spelling of 165248321 in words is "one hundred sixty-five million, two hundred forty-eight thousand, three hundred twenty-one".