491711 has 4 divisors (see below), whose sum is σ = 536424. Its totient is φ = 447000.

The previous prime is 491707. The next prime is 491719. The reversal of 491711 is 117194.

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 491711 - 2² = 491707 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22340 + ... + 22361.

It is an arithmetic number, because the mean of its divisors is an integer number (134106).

2⁴⁹¹⁷¹¹ is an apocalyptic number.

491711 is a deficient number, since it is larger than the sum of its proper divisors (44713).

491711 is a wasteful number, since it uses less digits than its factorization.

491711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44712.

The product of its digits is 252, while the sum is 23.

The square root of 491711 is about 701.2210778349. The cubic root of 491711 is about 78.9290074182.

The spelling of 491711 in words is "four hundred ninety-one thousand, seven hundred eleven".