164084621 has 4 divisors (see below), whose sum is σ = 166395744. Its totient is φ = 161773500.

The previous prime is 164084617. The next prime is 164084623. The reversal of 164084621 is 126480461.

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 164084621 - 2² = 164084617 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164084623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1155455 + ... + 1155596.

It is an arithmetic number, because the mean of its divisors is an integer number (41598936).

Almost surely, 2^164084621 is an apocalyptic number.

It is an amenable number.

164084621 is a deficient number, since it is larger than the sum of its proper divisors (2311123).

164084621 is an equidigital number, since it uses as much as digits as its factorization.

164084621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2311122.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 164084621 is about 12809.5519437645. The cubic root of 164084621 is about 547.4644956578.

The spelling of 164084621 in words is "one hundred sixty-four million, eighty-four thousand, six hundred twenty-one".