491999544 has 48 divisors (see below), whose sum is σ = 1340235000. Its totient is φ = 163047744.

The previous prime is 491999539. The next prime is 491999561. The reversal of 491999544 is 445999194.

491999544 is a `hidden beast` number, since 4 + 9 + 1 + 9 + 99 + 544 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7294 + ... + 32205.

Almost surely, 2^491999544 is an apocalyptic number.

It is an amenable number.

491999544 is an abundant number, since it is smaller than the sum of its proper divisors (848235456).

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

491999544 is a wasteful number, since it uses less digits than its factorization.

491999544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39684 (or 39677 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 54.

The square root of 491999544 is about 22181.0627337826. The cubic root of 491999544 is about 789.4444334033. Note that the first 4 decimals are identical.

The spelling of 491999544 in words is "four hundred ninety-one million, nine hundred ninety-nine thousand, five hundred forty-four".