164391 has 8 divisors (see below), whose sum is σ = 225264. Its totient is φ = 106560.

The previous prime is 164387. The next prime is 164413. The reversal of 164391 is 193461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 164391 - 2² = 164387 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164321) 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 7 ways as a sum of consecutive naturals, for example, 630 + ... + 851.

It is an arithmetic number, because the mean of its divisors is an integer number (28158).

2¹⁶⁴³⁹¹ is an apocalyptic number.

164391 is a deficient number, since it is larger than the sum of its proper divisors (60873).

164391 is a wasteful number, since it uses less digits than its factorization.

164391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1521.

The product of its digits is 648, while the sum is 24.

The square root of 164391 is about 405.4516000708. The cubic root of 164391 is about 54.7805025919.

It can be divided in two parts, 164 and 391, that added together give a palindrome (555).

The spelling of 164391 in words is "one hundred sixty-four thousand, three hundred ninety-one".