164543189 has 4 divisors (see below), whose sum is σ = 164619756. Its totient is φ = 164466624.

The previous prime is 164543179. The next prime is 164543207. The reversal of 164543189 is 981345461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 981345461 = 29009 ⋅33829.

It can be written as a sum of positive squares in 2 ways, for example, as 149255089 + 15288100 = 12217^2 + 3910^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164543189 is a prime.

It is a super-2 number, since 2×164543189² = 54148922092579442, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164543179) 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 in 3 ways as a sum of consecutive naturals, for example, 34964 + ... + 39389.

It is an arithmetic number, because the mean of its divisors is an integer number (41154939).

Almost surely, 2^164543189 is an apocalyptic number.

It is an amenable number.

164543189 is a deficient number, since it is larger than the sum of its proper divisors (76567).

164543189 is an equidigital number, since it uses as much as digits as its factorization.

164543189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76566.

The product of its digits is 103680, while the sum is 41.

The square root of 164543189 is about 12827.4389103983. The cubic root of 164543189 is about 547.9740217585.

The spelling of 164543189 in words is "one hundred sixty-four million, five hundred forty-three thousand, one hundred eighty-nine".