491971776 has 112 divisors (see below), whose sum is σ = 1357884000. Its totient is φ = 157007872.

The previous prime is 491971763. The next prime is 491971787. The reversal of 491971776 is 677179194.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 829336 + ... + 829928.

Almost surely, 2^491971776 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 491971776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (678942000).

491971776 is an abundant number, since it is smaller than the sum of its proper divisors (865912224).

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

491971776 is a wasteful number, since it uses less digits than its factorization.

491971776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 786 (or 776 counting only the distinct ones).

The product of its digits is 666792, while the sum is 51.

The square root of 491971776 is about 22180.4367856001. The cubic root of 491971776 is about 789.4295812855.

The spelling of 491971776 in words is "four hundred ninety-one million, nine hundred seventy-one thousand, seven hundred seventy-six".