491216197 has 8 divisors (see below), whose sum is σ = 501298200. Its totient is φ = 481224960.

The previous prime is 491216191. The next prime is 491216249. The reversal of 491216197 is 791612194.

It can be written as a sum of positive squares in 4 ways, for example, as 52983841 + 438232356 = 7279^2 + 20934^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 491216197 - 2³ = 491216189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491216191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11704 + ... + 33457.

It is an arithmetic number, because the mean of its divisors is an integer number (62662275).

Almost surely, 2^491216197 is an apocalyptic number.

It is an amenable number.

491216197 is a deficient number, since it is larger than the sum of its proper divisors (10082003).

491216197 is a wasteful number, since it uses less digits than its factorization.

491216197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45383.

The product of its digits is 27216, while the sum is 40.

The square root of 491216197 is about 22163.3976862755. The cubic root of 491216197 is about 789.0252342185.

The spelling of 491216197 in words is "four hundred ninety-one million, two hundred sixteen thousand, one hundred ninety-seven".