491184891 has 32 divisors (see below), whose sum is σ = 743904000. Its totient is φ = 324241704.

The previous prime is 491184857. The next prime is 491184899. The reversal of 491184891 is 198481194.

491184891 is a `hidden beast` number, since 491 + 1 + 84 + 89 + 1 = 666.

It is not a de Polignac number, because 491184891 - 2⁷ = 491184763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (491184899) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 232960 + ... + 235058.

It is an arithmetic number, because the mean of its divisors is an integer number (23247000).

Almost surely, 2^491184891 is an apocalyptic number.

491184891 is a deficient number, since it is larger than the sum of its proper divisors (252719109).

491184891 is an equidigital number, since it uses as much as digits as its factorization.

491184891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2227 (or 2209 counting only the distinct ones).

The product of its digits is 82944, while the sum is 45.

The square root of 491184891 is about 22162.6914204931. The cubic root of 491184891 is about 789.0084719124.

The spelling of 491184891 in words is "four hundred ninety-one million, one hundred eighty-four thousand, eight hundred ninety-one".