491785854 has 64 divisors (see below), whose sum is σ = 1207488000. Its totient is φ = 133104384.

The previous prime is 491785841. The next prime is 491785897. The reversal of 491785854 is 458587194.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 491785797 and 491785806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32814 + ... + 45390.

It is an arithmetic number, because the mean of its divisors is an integer number (18867000).

Almost surely, 2^491785854 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491785854, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (603744000).

491785854 is an abundant number, since it is smaller than the sum of its proper divisors (715702146).

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

491785854 is a wasteful number, since it uses less digits than its factorization.

491785854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12622 (or 12608 counting only the distinct ones).

The product of its digits is 1612800, while the sum is 51.

The square root of 491785854 is about 22176.2452637952. The cubic root of 491785854 is about 789.3301238053.

The spelling of 491785854 in words is "four hundred ninety-one million, seven hundred eighty-five thousand, eight hundred fifty-four".