172173355 has 4 divisors (see below), whose sum is σ = 206608032. Its totient is φ = 137738680.

The previous prime is 172173343. The next prime is 172173373. The reversal of 172173355 is 553371271.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-172173355 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 172173355.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 17217331 + ... + 17217340.

It is an arithmetic number, because the mean of its divisors is an integer number (51652008).

Almost surely, 2^172173355 is an apocalyptic number.

172173355 is a deficient number, since it is larger than the sum of its proper divisors (34434677).

172173355 is an equidigital number, since it uses as much as digits as its factorization.

172173355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34434676.

The product of its digits is 22050, while the sum is 34.

The square root of 172173355 is about 13121.4844815669. The cubic root of 172173355 is about 556.3165508894.

It can be divided in two parts, 1721 and 73355, that added together give a square (75076 = 274²).

The spelling of 172173355 in words is "one hundred seventy-two million, one hundred seventy-three thousand, three hundred fifty-five".