164240321 has 4 divisors (see below), whose sum is σ = 187703232. Its totient is φ = 140777412.

The previous prime is 164240287. The next prime is 164240347. The reversal of 164240321 is 123042461.

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.

It is a cyclic number.

It is not a de Polignac number, because 164240321 - 2⁶ = 164240257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164200321) 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, 11731445 + ... + 11731458.

It is an arithmetic number, because the mean of its divisors is an integer number (46925808).

Almost surely, 2^164240321 is an apocalyptic number.

It is an amenable number.

164240321 is a deficient number, since it is larger than the sum of its proper divisors (23462911).

164240321 is an equidigital number, since it uses as much as digits as its factorization.

164240321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23462910.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 164240321 is about 12815.6279986585. The cubic root of 164240321 is about 547.6376040498.

Adding to 164240321 its reverse (123042461), we get a palindrome (287282782).

The spelling of 164240321 in words is "one hundred sixty-four million, two hundred forty thousand, three hundred twenty-one".