164647321 has 2 divisors, whose sum is σ = 164647322. Its totient is φ = 164647320.

The previous prime is 164647289. The next prime is 164647333. The reversal of 164647321 is 123746461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107433225 + 57214096 = 10365^2 + 7564^2 .

It is a cyclic number.

It is not a de Polignac number, because 164647321 - 2⁵ = 164647289 is a prime.

It is not a weakly prime, because it can be changed into another prime (164647391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82323660 + 82323661.

It is an arithmetic number, because the mean of its divisors is an integer number (82323661).

Almost surely, 2^164647321 is an apocalyptic number.

It is an amenable number.

164647321 is a deficient number, since it is larger than the sum of its proper divisors (1).

164647321 is an equidigital number, since it uses as much as digits as its factorization.

164647321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 34.

The square root of 164647321 is about 12831.4972236290. The cubic root of 164647321 is about 548.0895934374.

The spelling of 164647321 in words is "one hundred sixty-four million, six hundred forty-seven thousand, three hundred twenty-one".