173223145 has 4 divisors (see below), whose sum is σ = 207867780. Its totient is φ = 138578512.

The previous prime is 173223139. The next prime is 173223163. The reversal of 173223145 is 541322371.

173223145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 52838361 + 120384784 = 7269^2 + 10972^2 .

It is a cyclic number.

It is not a de Polignac number, because 173223145 - 2¹³ = 173214953 is a prime.

It is a super-3 number, since 3×173223145³ (a number of 26 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17322310 + ... + 17322319.

It is an arithmetic number, because the mean of its divisors is an integer number (51966945).

Almost surely, 2^173223145 is an apocalyptic number.

It is an amenable number.

173223145 is a deficient number, since it is larger than the sum of its proper divisors (34644635).

173223145 is an equidigital number, since it uses as much as digits as its factorization.

173223145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34644634.

The product of its digits is 5040, while the sum is 28.

The square root of 173223145 is about 13161.4264044594. The cubic root of 173223145 is about 557.4449341336. Note that the first 3 decimals are identical.

The spelling of 173223145 in words is "one hundred seventy-three million, two hundred twenty-three thousand, one hundred forty-five".