164221186 has 4 divisors (see below), whose sum is σ = 246331782. Its totient is φ = 82110592.

The previous prime is 164221181. The next prime is 164221217. The reversal of 164221186 is 681122461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 681122461 = 4673 ⋅145757.

It can be written as a sum of positive squares in only one way, i.e., 102111025 + 62110161 = 10105^2 + 7881^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (164221181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41055295 + ... + 41055298.

Almost surely, 2^164221186 is an apocalyptic number.

164221186 is a deficient number, since it is larger than the sum of its proper divisors (82110596).

164221186 is an equidigital number, since it uses as much as digits as its factorization.

164221186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82110595.

The product of its digits is 4608, while the sum is 31.

The square root of 164221186 is about 12814.8814274655. The cubic root of 164221186 is about 547.6163355158.

The spelling of 164221186 in words is "one hundred sixty-four million, two hundred twenty-one thousand, one hundred eighty-six".