491222785 has 4 divisors (see below), whose sum is σ = 589467348. Its totient is φ = 392978224.

The previous prime is 491222749. The next prime is 491222791. The reversal of 491222785 is 587222194.

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 145709041 + 345513744 = 12071^2 + 18588^2 .

It is a cyclic number.

It is not a de Polignac number, because 491222785 - 2⁷ = 491222657 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49122274 + ... + 49122283.

It is an arithmetic number, because the mean of its divisors is an integer number (147366837).

Almost surely, 2^491222785 is an apocalyptic number.

It is an amenable number.

491222785 is a deficient number, since it is larger than the sum of its proper divisors (98244563).

491222785 is an equidigital number, since it uses as much as digits as its factorization.

491222785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98244562.

The product of its digits is 80640, while the sum is 40.

The square root of 491222785 is about 22163.5463091988. The cubic root of 491222785 is about 789.0287615689.

The spelling of 491222785 in words is "four hundred ninety-one million, two hundred twenty-two thousand, seven hundred eighty-five".