491180787 has 16 divisors (see below), whose sum is σ = 744599680. Its totient is φ = 319837896.

The previous prime is 491180783. The next prime is 491180821. The reversal of 491180787 is 787081194.

491180787 is a `hidden beast` number, since 491 + 1 + 80 + 7 + 87 = 666.

It is not a de Polignac number, because 491180787 - 2² = 491180783 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491180783) 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 15 ways as a sum of consecutive naturals, for example, 210373 + ... + 212694.

It is an arithmetic number, because the mean of its divisors is an integer number (46537480).

Almost surely, 2^491180787 is an apocalyptic number.

491180787 is a deficient number, since it is larger than the sum of its proper divisors (253418893).

491180787 is a wasteful number, since it uses less digits than its factorization.

491180787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423119 (or 423113 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 45.

The square root of 491180787 is about 22162.5988322669. The cubic root of 491180787 is about 789.0062744372.

The spelling of 491180787 in words is "four hundred ninety-one million, one hundred eighty thousand, seven hundred eighty-seven".