491849899 has 16 divisors (see below), whose sum is σ = 536699520. Its totient is φ = 448906240.

The previous prime is 491849887. The next prime is 491849923. The reversal of 491849899 is 998948194.

It is a cyclic number.

It is not a de Polignac number, because 491849899 - 2¹⁷ = 491718827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (491849879) 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 15 ways as a sum of consecutive naturals, for example, 118542 + ... + 122620.

It is an arithmetic number, because the mean of its divisors is an integer number (33543720).

Almost surely, 2^491849899 is an apocalyptic number.

491849899 is a deficient number, since it is larger than the sum of its proper divisors (44849621).

491849899 is a wasteful number, since it uses less digits than its factorization.

491849899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4310.

The product of its digits is 6718464, while the sum is 61.

The square root of 491849899 is about 22177.6892168684. The cubic root of 491849899 is about 789.3643869933.

The spelling of 491849899 in words is "four hundred ninety-one million, eight hundred forty-nine thousand, eight hundred ninety-nine".