491018 has 12 divisors (see below), whose sum is σ = 809970. Its totient is φ = 223080.

The previous prime is 491003. The next prime is 491039. The reversal of 491018 is 810194.

It can be written as a sum of positive squares in only one way, i.e., 267289 + 223729 = 517^2 + 473^2 .

It is a junction number, because it is equal to n+sod(n) for n = 490984 and 491002.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 491018.

It is an unprimeable number.

491018 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 773 + ... + 1256.

2⁴⁹¹⁰¹⁸ is an apocalyptic number.

491018 is a deficient number, since it is larger than the sum of its proper divisors (318952).

491018 is a wasteful number, since it uses less digits than its factorization.

491018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2053 (or 2042 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 491018 is about 700.7267655799. The cubic root of 491018 is about 78.8919100726.

The spelling of 491018 in words is "four hundred ninety-one thousand, eighteen".