491538209736 has 32 divisors (see below), whose sum is σ = 1404394885440. Its totient is φ = 140439488448.

The previous prime is 491538209683. The next prime is 491538209749. The reversal of 491538209736 is 637902835194.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1462911171 + ... + 1462911506.

It is an arithmetic number, because the mean of its divisors is an integer number (43887340170).

It is a 1-persistent number, because it is pandigital, but 2⋅491538209736 = 983076419472 is not.

Almost surely, 2^491538209736 is an apocalyptic number.

It is an amenable number.

491538209736 is an abundant number, since it is smaller than the sum of its proper divisors (912856675704).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

491538209736 is a wasteful number, since it uses less digits than its factorization.

491538209736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2925822693 (or 2925822689 counting only the distinct ones).

The product of its (nonzero) digits is 9797760, while the sum is 57.

The spelling of 491538209736 in words is "four hundred ninety-one billion, five hundred thirty-eight million, two hundred nine thousand, seven hundred thirty-six".