491447816 has 16 divisors (see below), whose sum is σ = 937083600. Its totient is φ = 241558864.

The previous prime is 491447807. The next prime is 491447819. The reversal of 491447816 is 618744194.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (491447819) 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, 520130 + ... + 521073.

It is an arithmetic number, because the mean of its divisors is an integer number (58567725).

Almost surely, 2^491447816 is an apocalyptic number.

It is an amenable number.

491447816 is a deficient number, since it is larger than the sum of its proper divisors (445635784).

491447816 is a wasteful number, since it uses less digits than its factorization.

491447816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1041268 (or 1041264 counting only the distinct ones).

The product of its digits is 193536, while the sum is 44.

The square root of 491447816 is about 22168.6223297705. The cubic root of 491447816 is about 789.1492288535.

The spelling of 491447816 in words is "four hundred ninety-one million, four hundred forty-seven thousand, eight hundred sixteen".