164491221 has 8 divisors (see below), whose sum is σ = 224671104. Its totient is φ = 106986080.

The previous prime is 164491213. The next prime is 164491241. The reversal of 164491221 is 122194461.

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

It is a cyclic number.

It is not a de Polignac number, because 164491221 - 2³ = 164491213 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164491241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 668541 + ... + 668786.

It is an arithmetic number, because the mean of its divisors is an integer number (28083888).

Almost surely, 2^164491221 is an apocalyptic number.

It is an amenable number.

164491221 is a deficient number, since it is larger than the sum of its proper divisors (60179883).

164491221 is a wasteful number, since it uses less digits than its factorization.

164491221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1337371.

The product of its digits is 3456, while the sum is 30.

The square root of 164491221 is about 12825.4130927624. The cubic root of 164491221 is about 547.9163264453.

The spelling of 164491221 in words is "one hundred sixty-four million, four hundred ninety-one thousand, two hundred twenty-one".