173213545 has 8 divisors (see below), whose sum is σ = 208366920. Its totient is φ = 138230400.

The previous prime is 173213533. The next prime is 173213563. The reversal of 173213545 is 545312371.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 28901376 + 144312169 = 5376^2 + 12013^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-173213545 is a prime.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 40306 + ... + 44395.

It is an arithmetic number, because the mean of its divisors is an integer number (26045865).

Almost surely, 2^173213545 is an apocalyptic number.

It is an amenable number.

173213545 is a deficient number, since it is larger than the sum of its proper divisors (35153375).

173213545 is an equidigital number, since it uses as much as digits as its factorization.

173213545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85115.

The product of its digits is 12600, while the sum is 31.

The square root of 173213545 is about 13161.0616972948. The cubic root of 173213545 is about 557.4346361060.

The spelling of 173213545 in words is "one hundred seventy-three million, two hundred thirteen thousand, five hundred forty-five".