491143736850 has 384 divisors, whose sum is σ = 1472557750272. Its totient is φ = 107130470400.

The previous prime is 491143736803. The next prime is 491143736857. The reversal of 491143736850 is 58637341194.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a junction number, because it is equal to n+sod(n) for n = 491143736793 and 491143736802.

It is not an unprimeable number, because it can be changed into a prime (491143736857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 38016592 + ... + 38029508.

It is an arithmetic number, because the mean of its divisors is an integer number (3834785808).

Almost surely, 2^491143736850 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491143736850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (736278875136).

491143736850 is an abundant number, since it is smaller than the sum of its proper divisors (981414013422).

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

491143736850 is a wasteful number, since it uses less digits than its factorization.

491143736850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13030 (or 13025 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 51.

It can be divided in two parts, 491 and 143736850, that added together give a palindrome (143737341).

The spelling of 491143736850 in words is "four hundred ninety-one billion, one hundred forty-three million, seven hundred thirty-six thousand, eight hundred fifty".