491111585 has 4 divisors (see below), whose sum is σ = 589333908. Its totient is φ = 392889264.

The previous prime is 491111567. The next prime is 491111587. The reversal of 491111585 is 585111194.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 290634304 + 200477281 = 17048^2 + 14159^2 .

It is a cyclic number.

It is not a de Polignac number, because 491111585 - 2⁸ = 491111329 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (491111587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49111154 + ... + 49111163.

It is an arithmetic number, because the mean of its divisors is an integer number (147333477).

Almost surely, 2^491111585 is an apocalyptic number.

It is an amenable number.

491111585 is a deficient number, since it is larger than the sum of its proper divisors (98222323).

491111585 is an equidigital number, since it uses as much as digits as its factorization.

491111585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98222322.

The product of its digits is 7200, while the sum is 35.

The square root of 491111585 is about 22161.0375434004. The cubic root of 491111585 is about 788.9692185791.

The spelling of 491111585 in words is "four hundred ninety-one million, one hundred eleven thousand, five hundred eighty-five".