172201171217 has 4 divisors (see below), whose sum is σ = 172202674740. Its totient is φ = 172199667696.

The previous prime is 172201171211. The next prime is 172201171273. The reversal of 172201171217 is 712171102271.

172201171217 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 8492728336 + 163708442881 = 92156^2 + 404609^2 .

It is a cyclic number.

It is not a de Polignac number, because 172201171217 - 2⁴ = 172201171201 is a prime.

It is a super-2 number, since 2×172201171217² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172201171211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 564398 + ... + 814215.

It is an arithmetic number, because the mean of its divisors is an integer number (43050668685).

Almost surely, 2^172201171217 is an apocalyptic number.

It is an amenable number.

172201171217 is a deficient number, since it is larger than the sum of its proper divisors (1503523).

172201171217 is a wasteful number, since it uses less digits than its factorization.

172201171217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1503522.

The product of its (nonzero) digits is 2744, while the sum is 32.

Adding to 172201171217 its reverse (712171102271), we get a palindrome (884372273488).

The spelling of 172201171217 in words is "one hundred seventy-two billion, two hundred one million, one hundred seventy-one thousand, two hundred seventeen".