2172608173 has 4 divisors (see below), whose sum is σ = 2191834908. Its totient is φ = 2153381440.

The previous prime is 2172608161. The next prime is 2172608183. The reversal of 2172608173 is 3718062712.

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 11009124 + 2161599049 = 3318^2 + 46493^2 .

It is a cyclic number.

It is not a de Polignac number, because 2172608173 - 2¹⁷ = 2172477101 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 (2172608183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9613198 + ... + 9613423.

It is an arithmetic number, because the mean of its divisors is an integer number (547958727).

Almost surely, 2^2172608173 is an apocalyptic number.

It is an amenable number.

2172608173 is a deficient number, since it is larger than the sum of its proper divisors (19226735).

2172608173 is a wasteful number, since it uses less digits than its factorization.

2172608173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19226734.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 2172608173 is about 46611.2451346239. The cubic root of 2172608173 is about 1295.1710736365.

The spelling of 2172608173 in words is "two billion, one hundred seventy-two million, six hundred eight thousand, one hundred seventy-three".