491771 has 8 divisors (see below), whose sum is σ = 566784. Its totient is φ = 417960.

The previous prime is 491747. The next prime is 491773. The reversal of 491771 is 177194.

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 491771 - 2⁶ = 491707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491773) 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 7 ways as a sum of consecutive naturals, for example, 926 + ... + 1356.

It is an arithmetic number, because the mean of its divisors is an integer number (70848).

2⁴⁹¹⁷⁷¹ is an apocalyptic number.

491771 is a deficient number, since it is larger than the sum of its proper divisors (75013).

491771 is a wasteful number, since it uses less digits than its factorization.

491771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601.

The product of its digits is 1764, while the sum is 29.

The square root of 491771 is about 701.2638590431. The cubic root of 491771 is about 78.9322176696.

The spelling of 491771 in words is "four hundred ninety-one thousand, seven hundred seventy-one".