491709 has 8 divisors (see below), whose sum is σ = 659232. Its totient is φ = 326000.

The previous prime is 491707. The next prime is 491719. The reversal of 491709 is 907194.

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 491709 - 2¹ = 491707 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491707) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 427 + ... + 1079.

It is an arithmetic number, because the mean of its divisors is an integer number (82404).

2⁴⁹¹⁷⁰⁹ is an apocalyptic number.

It is an amenable number.

491709 is a deficient number, since it is larger than the sum of its proper divisors (167523).

491709 is a wasteful number, since it uses less digits than its factorization.

491709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907.

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 491709 is about 701.2196517497. The cubic root of 491709 is about 78.9289004053.

The spelling of 491709 in words is "four hundred ninety-one thousand, seven hundred nine".