673185109 has 4 divisors (see below), whose sum is σ = 689604300. Its totient is φ = 656765920.

The previous prime is 673185083. The next prime is 673185133. The reversal of 673185109 is 901581376.

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 146482609 + 526702500 = 12103^2 + 22950^2 .

It is a cyclic number.

It is not a de Polignac number, because 673185109 - 2⁵ = 673185077 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (673185179) 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, 8209534 + ... + 8209615.

It is an arithmetic number, because the mean of its divisors is an integer number (172401075).

Almost surely, 2^673185109 is an apocalyptic number.

It is an amenable number.

673185109 is a deficient number, since it is larger than the sum of its proper divisors (16419191).

673185109 is a wasteful number, since it uses less digits than its factorization.

673185109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16419190.

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 673185109 is about 25945.8110106429. The cubic root of 673185109 is about 876.4184271305.

It can be divided in two parts, 67318 and 5109, that added together give a palindrome (72427).

The spelling of 673185109 in words is "six hundred seventy-three million, one hundred eighty-five thousand, one hundred nine".