491891882 has 4 divisors (see below), whose sum is σ = 737837826. Its totient is φ = 245945940.

The previous prime is 491891867. The next prime is 491891929. The reversal of 491891882 is 288198194.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 313962961 + 177928921 = 17719^2 + 13339^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 491891882.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122972969 + ... + 122972972.

Almost surely, 2^491891882 is an apocalyptic number.

491891882 is a deficient number, since it is larger than the sum of its proper divisors (245945944).

491891882 is a wasteful number, since it uses less digits than its factorization.

491891882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245945943.

The product of its digits is 331776, while the sum is 50.

The square root of 491891882 is about 22178.6357109719. The cubic root of 491891882 is about 789.3868457029.

The spelling of 491891882 in words is "four hundred ninety-one million, eight hundred ninety-one thousand, eight hundred eighty-two".