491660117 has 8 divisors (see below), whose sum is σ = 534940056. Its totient is φ = 449160192.

The previous prime is 491660089. The next prime is 491660129. The reversal of 491660117 is 711066194.

It can be written as a sum of positive squares in 4 ways, for example, as 19945156 + 471714961 = 4466^2 + 21719^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 491660117 - 2²² = 487465813 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 (491660317) 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, 193688 + ... + 196209.

It is an arithmetic number, because the mean of its divisors is an integer number (66867507).

Almost surely, 2^491660117 is an apocalyptic number.

It is an amenable number.

491660117 is a deficient number, since it is larger than the sum of its proper divisors (43279939).

491660117 is a wasteful number, since it uses less digits than its factorization.

491660117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390007.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 491660117 is about 22173.4101346635. The cubic root of 491660117 is about 789.2628475979.

The spelling of 491660117 in words is "four hundred ninety-one million, six hundred sixty thousand, one hundred seventeen".