173309 has 2 divisors, whose sum is σ = 173310. Its totient is φ = 173308.

The previous prime is 173297. The next prime is 173347. The reversal of 173309 is 903371.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120409 + 52900 = 347^2 + 230^2 .

It is a cyclic number.

It is not a de Polignac number, because 173309 - 2⁴ = 173293 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (173359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86654 + 86655.

It is an arithmetic number, because the mean of its divisors is an integer number (86655).

2¹⁷³³⁰⁹ is an apocalyptic number.

It is an amenable number.

173309 is a deficient number, since it is larger than the sum of its proper divisors (1).

173309 is an equidigital number, since it uses as much as digits as its factorization.

173309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 567, while the sum is 23.

The square root of 173309 is about 416.3039754795. The cubic root of 173309 is about 55.7537014843.

The spelling of 173309 in words is "one hundred seventy-three thousand, three hundred nine".