491658489 has 48 divisors (see below), whose sum is σ = 842899200. Its totient is φ = 270200448.

The previous prime is 491658487. The next prime is 491658499. The reversal of 491658489 is 984856194.

491658489 is a `hidden beast` number, since 49 + 16 + 584 + 8 + 9 = 666.

It is not a de Polignac number, because 491658489 - 2¹ = 491658487 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (491658487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 801747 + ... + 802359.

It is an arithmetic number, because the mean of its divisors is an integer number (17560400).

Almost surely, 2^491658489 is an apocalyptic number.

It is an amenable number.

491658489 is a deficient number, since it is larger than the sum of its proper divisors (351240711).

491658489 is a wasteful number, since it uses less digits than its factorization.

491658489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1094 (or 1091 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 54.

The square root of 491658489 is about 22173.3734239966. The cubic root of 491658489 is about 789.2619764532.

The spelling of 491658489 in words is "four hundred ninety-one million, six hundred fifty-eight thousand, four hundred eighty-nine".