491580 has 36 divisors (see below), whose sum is σ = 1491672. Its totient is φ = 131040.

The previous prime is 491539. The next prime is 491581. The reversal of 491580 is 85194.

It is a tau number, because it is divible by the number of its divisors (36).

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491581) by changing a digit.

491580 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1186 + ... + 1545.

2⁴⁹¹⁵⁸⁰ is an apocalyptic number.

It is an amenable number.

491580 is an abundant number, since it is smaller than the sum of its proper divisors (1000092).

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

491580 is a wasteful number, since it uses less digits than its factorization.

491580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2746 (or 2741 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 491580 is about 701.1276631256. The cubic root of 491580 is about 78.9219974616.

The spelling of 491580 in words is "four hundred ninety-one thousand, five hundred eighty".