164573809 has 4 divisors (see below), whose sum is σ = 171729216. Its totient is φ = 157418404.

The previous prime is 164573803. The next prime is 164573831. The reversal of 164573809 is 908375461.

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 164573809 - 2⁷ = 164573681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164573803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3577669 + ... + 3577714.

It is an arithmetic number, because the mean of its divisors is an integer number (42932304).

Almost surely, 2^164573809 is an apocalyptic number.

It is an amenable number.

164573809 is a deficient number, since it is larger than the sum of its proper divisors (7155407).

164573809 is an equidigital number, since it uses as much as digits as its factorization.

164573809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7155406.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 164573809 is about 12828.6323900874. The cubic root of 164573809 is about 548.0080106542.

The spelling of 164573809 in words is "one hundred sixty-four million, five hundred seventy-three thousand, eight hundred nine".