491647 has 8 divisors (see below), whose sum is σ = 539280. Its totient is φ = 445440.

The previous prime is 491639. The next prime is 491651. The reversal of 491647 is 746194.

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 491647 - 2³ = 491639 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491627) 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, 447 + ... + 1087.

It is an arithmetic number, because the mean of its divisors is an integer number (67410).

2⁴⁹¹⁶⁴⁷ is an apocalyptic number.

491647 is a deficient number, since it is larger than the sum of its proper divisors (47633).

491647 is a wasteful number, since it uses less digits than its factorization.

491647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713.

The product of its digits is 6048, while the sum is 31.

The square root of 491647 is about 701.1754416692. The cubic root of 491647 is about 78.9255828621.

The spelling of 491647 in words is "four hundred ninety-one thousand, six hundred forty-seven".