491128 has 16 divisors (see below), whose sum is σ = 1004760. Its totient is φ = 223200.

The previous prime is 491083. The next prime is 491129. The reversal of 491128 is 821194.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2703 + ... + 2878.

2⁴⁹¹¹²⁸ is an apocalyptic number.

It is an amenable number.

491128 is an abundant number, since it is smaller than the sum of its proper divisors (513632).

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

491128 is a wasteful number, since it uses less digits than its factorization.

491128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5598 (or 5594 counting only the distinct ones).

The product of its digits is 576, while the sum is 25.

The square root of 491128 is about 700.8052511219. The cubic root of 491128 is about 78.8978008697.

The spelling of 491128 in words is "four hundred ninety-one thousand, one hundred twenty-eight".