491876289 has 12 divisors (see below), whose sum is σ = 714744576. Its totient is φ = 325952952.

The previous prime is 491876243. The next prime is 491876293. The reversal of 491876289 is 982678194.

491876289 is a `hidden beast` number, since 4 + 9 + 1 + 8 + 7 + 628 + 9 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-491876289 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (491876789) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 162129 + ... + 165134.

It is an arithmetic number, because the mean of its divisors is an integer number (59562048).

Almost surely, 2^491876289 is an apocalyptic number.

It is an amenable number.

491876289 is a deficient number, since it is larger than the sum of its proper divisors (222868287).

491876289 is a wasteful number, since it uses less digits than its factorization.

491876289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327436 (or 327433 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The square root of 491876289 is about 22178.2841761936. The cubic root of 491876289 is about 789.3785044125.

The spelling of 491876289 in words is "four hundred ninety-one million, eight hundred seventy-six thousand, two hundred eighty-nine".