164321321 has 4 divisors (see below), whose sum is σ = 166572372. Its totient is φ = 162070272.

The previous prime is 164321299. The next prime is 164321351. The reversal of 164321321 is 123123461.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 129049600 + 35271721 = 11360^2 + 5939^2 .

It is a cyclic number.

It is not a de Polignac number, because 164321321 - 2⁶ = 164321257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164321351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1125416 + ... + 1125561.

It is an arithmetic number, because the mean of its divisors is an integer number (41643093).

Almost surely, 2^164321321 is an apocalyptic number.

It is an amenable number.

164321321 is a deficient number, since it is larger than the sum of its proper divisors (2251051).

164321321 is an equidigital number, since it uses as much as digits as its factorization.

164321321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2251050.

The product of its digits is 864, while the sum is 23.

The square root of 164321321 is about 12818.7878132061. The cubic root of 164321321 is about 547.7276171789.

Adding to 164321321 its reverse (123123461), we get a palindrome (287444782).

The spelling of 164321321 in words is "one hundred sixty-four million, three hundred twenty-one thousand, three hundred twenty-one".