491505 has 32 divisors (see below), whose sum is σ = 933888. Its totient is φ = 216000.

The previous prime is 491503. The next prime is 491527. The reversal of 491505 is 505194.

491505 is nontrivially palindromic in base 8.

It is not a de Polignac number, because 491505 - 2¹ = 491503 is a prime.

491505 is a lucky 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 31 ways as a sum of consecutive naturals, for example, 3180 + ... + 3330.

It is an arithmetic number, because the mean of its divisors is an integer number (29184).

2⁴⁹¹⁵⁰⁵ is an apocalyptic number.

It is an amenable number.

491505 is a deficient number, since it is larger than the sum of its proper divisors (442383).

491505 is a wasteful number, since it uses less digits than its factorization.

491505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 491505 is about 701.0741758188. The cubic root of 491505 is about 78.9179835670.

Adding to 491505 its reverse (505194), we get a palindrome (996699).

Subtracting 491505 from its reverse (505194), we obtain a square (13689 = 117²).

The spelling of 491505 in words is "four hundred ninety-one thousand, five hundred five".