164560321 has 4 divisors (see below), whose sum is σ = 166878144. Its totient is φ = 162242500.

The previous prime is 164560303. The next prime is 164560327. The reversal of 164560321 is 123065461.

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: 123065461 = 131 ⋅939431.

It is a cyclic number.

It is not a de Polignac number, because 164560321 - 2²³ = 156171713 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 164560321.

It is not an unprimeable number, because it can be changed into a prime (164560327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1158805 + ... + 1158946.

It is an arithmetic number, because the mean of its divisors is an integer number (41719536).

Almost surely, 2^164560321 is an apocalyptic number.

It is an amenable number.

164560321 is a deficient number, since it is larger than the sum of its proper divisors (2317823).

164560321 is an equidigital number, since it uses as much as digits as its factorization.

164560321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2317822.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 164560321 is about 12828.1066802549. The cubic root of 164560321 is about 547.9930391873.

The spelling of 164560321 in words is "one hundred sixty-four million, five hundred sixty thousand, three hundred twenty-one".