491757489 has 12 divisors (see below), whose sum is σ = 711534096. Its totient is φ = 327276312.

The previous prime is 491757481. The next prime is 491757493. The reversal of 491757489 is 984757194.

491757489 is a `hidden beast` number, since 4 + 91 + 75 + 7 + 489 = 666.

It is not a de Polignac number, because 491757489 - 2³ = 491757481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (491757481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41259 + ... + 51824.

It is an arithmetic number, because the mean of its divisors is an integer number (59294508).

Almost surely, 2^491757489 is an apocalyptic number.

It is an amenable number.

491757489 is a deficient number, since it is larger than the sum of its proper divisors (219776607).

491757489 is a wasteful number, since it uses less digits than its factorization.

491757489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93676 (or 93673 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 54.

The square root of 491757489 is about 22175.6057188975. The cubic root of 491757489 is about 789.3149479727.

The spelling of 491757489 in words is "four hundred ninety-one million, seven hundred fifty-seven thousand, four hundred eighty-nine".