491500 has 24 divisors (see below), whose sum is σ = 1074528. Its totient is φ = 196400.

The previous prime is 491497. The next prime is 491501. The reversal of 491500 is 5194.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (491501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9 + ... + 991.

It is an arithmetic number, because the mean of its divisors is an integer number (44772).

2⁴⁹¹⁵⁰⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (537264).

491500 is an abundant number, since it is smaller than the sum of its proper divisors (583028).

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

491500 is a wasteful number, since it uses less digits than its factorization.

491500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1002 (or 990 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 491500 is about 701.0706098532. The cubic root of 491500 is about 78.9177159595.

Adding to 491500 its reverse (5194), we get a palindrome (496694).

The spelling of 491500 in words is "four hundred ninety-one thousand, five hundred".