172117201 has 4 divisors (see below), whose sum is σ = 173272500. Its totient is φ = 170961904.

The previous prime is 172117159. The next prime is 172117217. The reversal of 172117201 is 102711271.

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 66438801 + 105678400 = 8151^2 + 10280^2 .

It is a cyclic number.

It is not a de Polignac number, because 172117201 - 2¹³ = 172109009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172117241) by changing a digit.

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, 577426 + ... + 577723.

It is an arithmetic number, because the mean of its divisors is an integer number (43318125).

Almost surely, 2^172117201 is an apocalyptic number.

It is an amenable number.

172117201 is a deficient number, since it is larger than the sum of its proper divisors (1155299).

172117201 is a wasteful number, since it uses less digits than its factorization.

172117201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1155298.

The product of its (nonzero) digits is 196, while the sum is 22.

The square root of 172117201 is about 13119.3445339316. The cubic root of 172117201 is about 556.2560637979.

Adding to 172117201 its reverse (102711271), we get a palindrome (274828472).

The spelling of 172117201 in words is "one hundred seventy-two million, one hundred seventeen thousand, two hundred one".