168731217 has 6 divisors (see below), whose sum is σ = 243722882. Its totient is φ = 112487472.

The previous prime is 168731207. The next prime is 168731219. The reversal of 168731217 is 712137861.

It can be written as a sum of positive squares in only one way, i.e., 148937616 + 19793601 = 12204^2 + 4449^2 .

It is not a de Polignac number, because 168731217 - 2¹⁰ = 168730193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168731219) 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 5 ways as a sum of consecutive naturals, for example, 9373948 + ... + 9373965.

Almost surely, 2^168731217 is an apocalyptic number.

It is an amenable number.

168731217 is a deficient number, since it is larger than the sum of its proper divisors (74991665).

168731217 is a wasteful number, since it uses less digits than its factorization.

168731217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18747919 (or 18747916 counting only the distinct ones).

The product of its digits is 14112, while the sum is 36.

The square root of 168731217 is about 12989.6580786409. The cubic root of 168731217 is about 552.5842211720.

The spelling of 168731217 in words is "one hundred sixty-eight million, seven hundred thirty-one thousand, two hundred seventeen".