491863684 has 27 divisors (see below), whose sum is σ = 933161103. Its totient is φ = 226747872.

The previous prime is 491863667. The next prime is 491863709. The reversal of 491863684 is 486368194.

The square root of 491863684 is 22178.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 317623684 + 174240000 = 17822^2 + 13200^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 576202 + ... + 577054.

Almost surely, 2^491863684 is an apocalyptic number.

491863684 is the 22178-th square number.

It is an amenable number.

491863684 is a deficient number, since it is larger than the sum of its proper divisors (441297419).

491863684 is an equidigital number, since it uses as much as digits as its factorization.

491863684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1736 (or 868 counting only the distinct ones).

The product of its digits is 995328, while the sum is 49.

The cubic root of 491863684 is about 789.3717613884.

Multiplying 491863684 by its sum of digits (49), we get a square (24101320516 = 155246²).

The spelling of 491863684 in words is "four hundred ninety-one million, eight hundred sixty-three thousand, six hundred eighty-four".