491968197 has 24 divisors (see below), whose sum is σ = 854884160. Its totient is φ = 266328000.

The previous prime is 491968193. The next prime is 491968249. The reversal of 491968197 is 791869194.

491968197 is a `hidden beast` number, since 491 + 9 + 68 + 1 + 97 = 666.

It is not a de Polignac number, because 491968197 - 2² = 491968193 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 (491968193) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 204304 + ... + 206697.

Almost surely, 2^491968197 is an apocalyptic number.

It is an amenable number.

491968197 is a deficient number, since it is larger than the sum of its proper divisors (362915963).

491968197 is a wasteful number, since it uses less digits than its factorization.

491968197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411033 (or 411030 counting only the distinct ones).

The product of its digits is 979776, while the sum is 54.

The square root of 491968197 is about 22180.3561062486. The cubic root of 491968197 is about 789.4276669648.

The spelling of 491968197 in words is "four hundred ninety-one million, nine hundred sixty-eight thousand, one hundred ninety-seven".