164221573 has 2 divisors, whose sum is σ = 164221574. Its totient is φ = 164221572.

The previous prime is 164221571. The next prime is 164221597. The reversal of 164221573 is 375122461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 162639009 + 1582564 = 12753^2 + 1258^2 .

It is a cyclic number.

It is not a de Polignac number, because 164221573 - 2¹ = 164221571 is a prime.

Together with 164221571, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164221571) 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 as a sum of consecutive naturals, namely, 82110786 + 82110787.

It is an arithmetic number, because the mean of its divisors is an integer number (82110787).

Almost surely, 2^164221573 is an apocalyptic number.

It is an amenable number.

164221573 is a deficient number, since it is larger than the sum of its proper divisors (1).

164221573 is an equidigital number, since it uses as much as digits as its factorization.

164221573 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 31.

The square root of 164221573 is about 12814.8965270891. The cubic root of 164221573 is about 547.6167656823.

The spelling of 164221573 in words is "one hundred sixty-four million, two hundred twenty-one thousand, five hundred seventy-three".