491617 has 12 divisors (see below), whose sum is σ = 583680. Its totient is φ = 412776.

The previous prime is 491611. The next prime is 491627. The reversal of 491617 is 716194.

It is not a de Polignac number, because 491617 - 2⁷ = 491489 is a prime.

It is a Duffinian number.

491617 is a modest number, since divided by 1617 gives 49 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3808 + ... + 3934.

It is an arithmetic number, because the mean of its divisors is an integer number (48640).

2⁴⁹¹⁶¹⁷ is an apocalyptic number.

It is an amenable number.

491617 is a deficient number, since it is larger than the sum of its proper divisors (92063).

491617 is a wasteful number, since it uses less digits than its factorization.

491617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220 (or 213 counting only the distinct ones).

The product of its digits is 1512, while the sum is 28.

The square root of 491617 is about 701.1540486940. The cubic root of 491617 is about 78.9239774992.

The spelling of 491617 in words is "four hundred ninety-one thousand, six hundred seventeen".