491706641 has 8 divisors (see below), whose sum is σ = 494978880. Its totient is φ = 488445552.

The previous prime is 491706619. The next prime is 491706647. The reversal of 491706641 is 146607194.

It is a happy number.

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 491706641 - 2²⁶ = 424597777 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 491706595 and 491706604.

It is not an unprimeable number, because it can be changed into a prime (491706647) 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, 97211 + ... + 102143.

It is an arithmetic number, because the mean of its divisors is an integer number (61872360).

Almost surely, 2^491706641 is an apocalyptic number.

It is an amenable number.

491706641 is a deficient number, since it is larger than the sum of its proper divisors (3272239).

491706641 is a wasteful number, since it uses less digits than its factorization.

491706641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5575.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 491706641 is about 22174.4592042286. The cubic root of 491706641 is about 789.2877418323.

The spelling of 491706641 in words is "four hundred ninety-one million, seven hundred six thousand, six hundred forty-one".