491020 has 12 divisors (see below), whose sum is σ = 1031184. Its totient is φ = 196400.

The previous prime is 491003. The next prime is 491039. The reversal of 491020 is 20194.

It is a super-2 number, since 2×491020² = 482201280800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 490985 and 491003.

It is an unprimeable 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 3 ways as a sum of consecutive naturals, for example, 12256 + ... + 12295.

It is an arithmetic number, because the mean of its divisors is an integer number (85932).

2⁴⁹¹⁰²⁰ is an apocalyptic number.

It is an amenable number.

491020 is an abundant number, since it is smaller than the sum of its proper divisors (540164).

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

491020 is a wasteful number, since it uses less digits than its factorization.

491020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24560 (or 24558 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 491020 is about 700.7281926682. The cubic root of 491020 is about 78.8920171859.

The spelling of 491020 in words is "four hundred ninety-one thousand, twenty".