164218081 has 2 divisors, whose sum is σ = 164218082. Its totient is φ = 164218080.

The previous prime is 164218069. The next prime is 164218157. The reversal of 164218081 is 180812461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 163609681 + 608400 = 12791^2 + 780^2 .

It is a cyclic number.

It is not a de Polignac number, because 164218081 - 2⁵ = 164218049 is a prime.

It is a super-2 number, since 2×164218081² = 53935156254645122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (164218031) 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, 82109040 + 82109041.

It is an arithmetic number, because the mean of its divisors is an integer number (82109041).

Almost surely, 2^164218081 is an apocalyptic number.

It is an amenable number.

164218081 is a deficient number, since it is larger than the sum of its proper divisors (1).

164218081 is an equidigital number, since it uses as much as digits as its factorization.

164218081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3072, while the sum is 31.

The square root of 164218081 is about 12814.7602786786. The cubic root of 164218081 is about 547.6128841556.

The spelling of 164218081 in words is "one hundred sixty-four million, two hundred eighteen thousand, eighty-one".