491861992 has 32 divisors (see below), whose sum is σ = 963679680. Its totient is φ = 234910720.

The previous prime is 491861897. The next prime is 491862013. The reversal of 491861992 is 299168194.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177288 + ... + 180040.

It is an arithmetic number, because the mean of its divisors is an integer number (30114990).

Almost surely, 2^491861992 is an apocalyptic number.

It is an amenable number.

491861992 is a deficient number, since it is larger than the sum of its proper divisors (471817688).

491861992 is a wasteful number, since it uses less digits than its factorization.

491861992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3753 (or 3749 counting only the distinct ones).

The product of its digits is 279936, while the sum is 49.

The square root of 491861992 is about 22177.9618540568. The cubic root of 491861992 is about 789.3708562470.

The spelling of 491861992 in words is "four hundred ninety-one million, eight hundred sixty-one thousand, nine hundred ninety-two".