491103112500 has 1728 divisors, whose sum is σ = 2149737408000. Its totient is φ = 93139200000.

The previous prime is 491103112499. The next prime is 491103112501. The reversal of 491103112500 is 5211301194.

It is a happy number.

491103112500 is a `hidden beast` number, since 4 + 9 + 110 + 31 + 12 + 500 = 666.

It is an interprime number because it is at equal distance from previous prime (491103112499) and next prime (491103112501).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491103112501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 575 ways as a sum of consecutive naturals, for example, 5518012456 + ... + 5518012544.

It is an arithmetic number, because the mean of its divisors is an integer number (1244061000).

Almost surely, 2^491103112500 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491103112500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1074868704000).

491103112500 is an abundant number, since it is smaller than the sum of its proper divisors (1658634295500).

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

491103112500 is a wasteful number, since it uses less digits than its factorization.

491103112500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169 (or 130 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

Adding to 491103112500 its reverse (5211301194), we get a palindrome (496314413694).

The spelling of 491103112500 in words is "four hundred ninety-one billion, one hundred three million, one hundred twelve thousand, five hundred".