491263 has 4 divisors (see below), whose sum is σ = 495880. Its totient is φ = 486648.

The previous prime is 491261. The next prime is 491273. The reversal of 491263 is 362194.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 491263 - 2¹ = 491261 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2145 + ... + 2362.

It is an arithmetic number, because the mean of its divisors is an integer number (123970).

2⁴⁹¹²⁶³ is an apocalyptic number.

491263 is a deficient number, since it is larger than the sum of its proper divisors (4617).

491263 is a wasteful number, since it uses less digits than its factorization.

491263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4616.

The product of its digits is 1296, while the sum is 25.

The square root of 491263 is about 700.9015622753. The cubic root of 491263 is about 78.9050292822.

The spelling of 491263 in words is "four hundred ninety-one thousand, two hundred sixty-three".