491186085 has 16 divisors (see below), whose sum is σ = 846351744. Its totient is φ = 241814592.

The previous prime is 491186077. The next prime is 491186093. The reversal of 491186085 is 580681194.

It is an interprime number because it is at equal distance from previous prime (491186077) and next prime (491186093).

It is not a de Polignac number, because 491186085 - 2³ = 491186077 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 1259257 + ... + 1259646.

It is an arithmetic number, because the mean of its divisors is an integer number (52896984).

Almost surely, 2^491186085 is an apocalyptic number.

It is an amenable number.

491186085 is a deficient number, since it is larger than the sum of its proper divisors (355165659).

491186085 is a wasteful number, since it uses less digits than its factorization.

491186085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2518924.

The product of its (nonzero) digits is 69120, while the sum is 42.

The square root of 491186085 is about 22162.7183576384. The cubic root of 491186085 is about 789.0091112340.

The spelling of 491186085 in words is "four hundred ninety-one million, one hundred eighty-six thousand, eighty-five".