491065 has 4 divisors (see below), whose sum is σ = 589284. Its totient is φ = 392848.

The previous prime is 491059. The next prime is 491081. The reversal of 491065 is 560194.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 560194 = 2 ⋅280097.

It can be written as a sum of positive squares in 2 ways, for example, as 249001 + 242064 = 499^2 + 492^2 .

It is a cyclic number.

It is not a de Polignac number, because 491065 - 2⁷ = 490937 is a prime.

It is a super-2 number, since 2×491065² = 482289668450, which contains 22 as substring.

It is a Duffinian number.

491065 is a lucky number.

It is a congruent number.

It is an unprimeable number.

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, 49102 + ... + 49111.

It is an arithmetic number, because the mean of its divisors is an integer number (147321).

2⁴⁹¹⁰⁶⁵ is an apocalyptic number.

It is an amenable number.

491065 is a deficient number, since it is larger than the sum of its proper divisors (98219).

491065 is an equidigital number, since it uses as much as digits as its factorization.

491065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98218.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 491065 is about 700.7603013870. The cubic root of 491065 is about 78.8944271572.

The spelling of 491065 in words is "four hundred ninety-one thousand, sixty-five".