491919163 has 4 divisors (see below), whose sum is σ = 494494848. Its totient is φ = 489343480.

The previous prime is 491919149. The next prime is 491919173. The reversal of 491919163 is 361919194.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491919163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491919173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1287556 + ... + 1287937.

It is an arithmetic number, because the mean of its divisors is an integer number (123623712).

Almost surely, 2^491919163 is an apocalyptic number.

491919163 is a deficient number, since it is larger than the sum of its proper divisors (2575685).

491919163 is a wasteful number, since it uses less digits than its factorization.

491919163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2575684.

The product of its digits is 52488, while the sum is 43.

The square root of 491919163 is about 22179.2507312578. The cubic root of 491919163 is about 789.4014389264.

The spelling of 491919163 in words is "four hundred ninety-one million, nine hundred nineteen thousand, one hundred sixty-three".