164921 has 4 divisors (see below), whose sum is σ = 166992. Its totient is φ = 162852.

The previous prime is 164911. The next prime is 164953. The reversal of 164921 is 129461.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 164921 - 2¹⁴ = 148537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164911) 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, 911 + ... + 1076.

It is an arithmetic number, because the mean of its divisors is an integer number (41748).

2¹⁶⁴⁹²¹ is an apocalyptic number.

It is an amenable number.

164921 is a deficient number, since it is larger than the sum of its proper divisors (2071).

164921 is an equidigital number, since it uses as much as digits as its factorization.

164921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2070.

The product of its digits is 432, while the sum is 23.

The square root of 164921 is about 406.1046663115. The cubic root of 164921 is about 54.8393105973.

The spelling of 164921 in words is "one hundred sixty-four thousand, nine hundred twenty-one".