491311 has 4 divisors (see below), whose sum is σ = 498712. Its totient is φ = 483912.

The previous prime is 491299. The next prime is 491327. The reversal of 491311 is 113194.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 113194 = 2 ⋅56597.

It is a cyclic number.

It is not a de Polignac number, because 491311 - 2⁵ = 491279 is a prime.

It is a Duffinian number.

491311 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3600 + ... + 3733.

It is an arithmetic number, because the mean of its divisors is an integer number (124678).

2⁴⁹¹³¹¹ is an apocalyptic number.

491311 is a deficient number, since it is larger than the sum of its proper divisors (7401).

491311 is an equidigital number, since it uses as much as digits as its factorization.

491311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7400.

The product of its digits is 108, while the sum is 19.

The square root of 491311 is about 700.9358030519. The cubic root of 491311 is about 78.9075990653.

The spelling of 491311 in words is "four hundred ninety-one thousand, three hundred eleven".