491630517 has 12 divisors (see below), whose sum is σ = 811580640. Its totient is φ = 280931688.

The previous prime is 491630501. The next prime is 491630527. The reversal of 491630517 is 715036194.

491630517 is a `hidden beast` number, since 4 + 9 + 1 + 630 + 5 + 17 = 666.

It is not a de Polignac number, because 491630517 - 2⁴ = 491630501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491630527) 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, 3901767 + ... + 3901892.

It is an arithmetic number, because the mean of its divisors is an integer number (67631720).

Almost surely, 2^491630517 is an apocalyptic number.

It is an amenable number.

491630517 is a deficient number, since it is larger than the sum of its proper divisors (319950123).

491630517 is a wasteful number, since it uses less digits than its factorization.

491630517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7803672 (or 7803669 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 491630517 is about 22172.7426584985. The cubic root of 491630517 is about 789.2470083028.

The spelling of 491630517 in words is "four hundred ninety-one million, six hundred thirty thousand, five hundred seventeen".