491670617 has 8 divisors (see below), whose sum is σ = 520905672. Its totient is φ = 462470400.

The previous prime is 491670539. The next prime is 491670629. The reversal of 491670617 is 716076194.

It can be written as a sum of positive squares in 4 ways, for example, as 46840336 + 444830281 = 6844^2 + 21091^2 .

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 491670617 - 2¹⁸ = 491408473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491670637) 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, 23867 + ... + 39407.

It is an arithmetic number, because the mean of its divisors is an integer number (65113209).

Almost surely, 2^491670617 is an apocalyptic number.

It is an amenable number.

491670617 is a deficient number, since it is larger than the sum of its proper divisors (29235055).

491670617 is a wasteful number, since it uses less digits than its factorization.

491670617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17419.

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 491670617 is about 22173.6469034753. The cubic root of 491670617 is about 789.2684661141.

The spelling of 491670617 in words is "four hundred ninety-one million, six hundred seventy thousand, six hundred seventeen".