173305009 has 4 divisors (see below), whose sum is σ = 174628080. Its totient is φ = 171981940.

The previous prime is 173305001. The next prime is 173305031. The reversal of 173305009 is 900503371.

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 173305009 - 2³ = 173305001 is a prime.

It is a super-2 number, since 2×173305009² = 60069252288980162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (173305001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 661339 + ... + 661600.

It is an arithmetic number, because the mean of its divisors is an integer number (43657020).

Almost surely, 2^173305009 is an apocalyptic number.

It is an amenable number.

173305009 is a deficient number, since it is larger than the sum of its proper divisors (1323071).

173305009 is a wasteful number, since it uses less digits than its factorization.

173305009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1323070.

The product of its (nonzero) digits is 2835, while the sum is 28.

The square root of 173305009 is about 13164.5360343614. The cubic root of 173305009 is about 557.5327351126.

The spelling of 173305009 in words is "one hundred seventy-three million, three hundred five thousand, nine".