164552021 has 2 divisors, whose sum is σ = 164552022. Its totient is φ = 164552020.

The previous prime is 164551991. The next prime is 164552033. The reversal of 164552021 is 120255461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87796900 + 76755121 = 9370^2 + 8761^2 .

It is a cyclic number.

It is not a de Polignac number, because 164552021 - 2⁶ = 164551957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164552071) 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 as a sum of consecutive naturals, namely, 82276010 + 82276011.

It is an arithmetic number, because the mean of its divisors is an integer number (82276011).

Almost surely, 2^164552021 is an apocalyptic number.

It is an amenable number.

164552021 is a deficient number, since it is larger than the sum of its proper divisors (1).

164552021 is an equidigital number, since it uses as much as digits as its factorization.

164552021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 164552021 is about 12827.7831677964. The cubic root of 164552021 is about 547.9838259119.

The spelling of 164552021 in words is "one hundred sixty-four million, five hundred fifty-two thousand, twenty-one".