491305 has 8 divisors (see below), whose sum is σ = 596232. Its totient is φ = 388608.

The previous prime is 491299. The next prime is 491327. The reversal of 491305 is 503194.

It can be written as a sum of positive squares in 4 ways, for example, as 2704 + 488601 = 52^2 + 699^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 491305 - 2³ = 491297 is a prime.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 22 + ... + 991.

It is an arithmetic number, because the mean of its divisors is an integer number (74529).

2⁴⁹¹³⁰⁵ is an apocalyptic number.

It is an amenable number.

491305 is a deficient number, since it is larger than the sum of its proper divisors (104927).

491305 is a wasteful number, since it uses less digits than its factorization.

491305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1115.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 491305 is about 700.9315230463. The cubic root of 491305 is about 78.9072778515.

Adding to 491305 its reverse (503194), we get a palindrome (994499).

The spelling of 491305 in words is "four hundred ninety-one thousand, three hundred five".