164336621 has 4 divisors (see below), whose sum is σ = 164930172. Its totient is φ = 163743072.

The previous prime is 164336593. The next prime is 164336659. The reversal of 164336621 is 126633461.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9060100 + 155276521 = 3010^2 + 12461^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164336621 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 (164332621) 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, 296360 + ... + 296913.

It is an arithmetic number, because the mean of its divisors is an integer number (41232543).

Almost surely, 2^164336621 is an apocalyptic number.

It is an amenable number.

164336621 is a deficient number, since it is larger than the sum of its proper divisors (593551).

164336621 is an equidigital number, since it uses as much as digits as its factorization.

164336621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593550.

The product of its digits is 15552, while the sum is 32.

The square root of 164336621 is about 12819.3845796122. The cubic root of 164336621 is about 547.7446163373.

The spelling of 164336621 in words is "one hundred sixty-four million, three hundred thirty-six thousand, six hundred twenty-one".