164181 has 4 divisors (see below), whose sum is σ = 218912. Its totient is φ = 109452.

The previous prime is 164173. The next prime is 164183. The reversal of 164181 is 181461.

164181 is nontrivially palindromic in base 6.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 164181 - 2³ = 164173 is a prime.

It is a super-2 number, since 2×164181² = 53910801522, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

164181 is a lucky number.

It is a zygodrome in base 4.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 164181.

It is not an unprimeable number, because it can be changed into a prime (164183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27361 + ... + 27366.

It is an arithmetic number, because the mean of its divisors is an integer number (54728).

2¹⁶⁴¹⁸¹ is an apocalyptic number.

It is an amenable number.

164181 is a deficient number, since it is larger than the sum of its proper divisors (54731).

164181 is an equidigital number, since it uses as much as digits as its factorization.

164181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54730.

The product of its digits is 192, while the sum is 21.

The square root of 164181 is about 405.1925468219. The cubic root of 164181 is about 54.7571663437.

The spelling of 164181 in words is "one hundred sixty-four thousand, one hundred eighty-one".