164805321 has 4 divisors (see below), whose sum is σ = 219740432. Its totient is φ = 109870212.

The previous prime is 164805317. The next prime is 164805341. The reversal of 164805321 is 123508461.

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: 123508461 = 3 ⋅41169487.

It is not a de Polignac number, because 164805321 - 2² = 164805317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164805341) 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, 27467551 + ... + 27467556.

It is an arithmetic number, because the mean of its divisors is an integer number (54935108).

Almost surely, 2^164805321 is an apocalyptic number.

It is an amenable number.

164805321 is a deficient number, since it is larger than the sum of its proper divisors (54935111).

164805321 is an equidigital number, since it uses as much as digits as its factorization.

164805321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54935110.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 164805321 is about 12837.6524723175. The cubic root of 164805321 is about 548.2648578943.

The spelling of 164805321 in words is "one hundred sixty-four million, eight hundred five thousand, three hundred twenty-one".