172204605 has 12 divisors (see below), whose sum is σ = 298488060. Its totient is φ = 91842432.

The previous prime is 172204603. The next prime is 172204621. The reversal of 172204605 is 506402271.

It can be written as a sum of positive squares in 2 ways, for example, as 28708164 + 143496441 = 5358^2 + 11979^2 .

It is not a de Polignac number, because 172204605 - 2¹ = 172204603 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172204603) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 1913340 + ... + 1913429.

It is an arithmetic number, because the mean of its divisors is an integer number (24874005).

Almost surely, 2^172204605 is an apocalyptic number.

172204605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

172204605 is a deficient number, since it is larger than the sum of its proper divisors (126283455).

172204605 is a wasteful number, since it uses less digits than its factorization.

172204605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3826780 (or 3826777 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 172204605 is about 13122.6752226823. The cubic root of 172204605 is about 556.3502065820.

Adding to 172204605 its reverse (506402271), we get a palindrome (678606876).

The spelling of 172204605 in words is "one hundred seventy-two million, two hundred four thousand, six hundred five".