165452921 has 8 divisors (see below), whose sum is σ = 171026688. Its totient is φ = 159894000.

The previous prime is 165452897. The next prime is 165452929. The reversal of 165452921 is 129254561.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165452921 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165452929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21851 + ... + 28431.

It is an arithmetic number, because the mean of its divisors is an integer number (21378336).

Almost surely, 2^165452921 is an apocalyptic number.

It is an amenable number.

165452921 is a deficient number, since it is larger than the sum of its proper divisors (5573767).

165452921 is an equidigital number, since it uses as much as digits as its factorization.

165452921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7423.

The product of its digits is 21600, while the sum is 35.

The square root of 165452921 is about 12862.8504228262. The cubic root of 165452921 is about 548.9820521160.

The spelling of 165452921 in words is "one hundred sixty-five million, four hundred fifty-two thousand, nine hundred twenty-one".