491716643 has 8 divisors (see below), whose sum is σ = 550916400. Its totient is φ = 434933280.

The previous prime is 491716639. The next prime is 491716733. The reversal of 491716643 is 346617194.

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 491716643 - 2² = 491716639 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 491716643.

It is not an unprimeable number, because it can be changed into a prime (491716243) 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, 603668 + ... + 604481.

It is an arithmetic number, because the mean of its divisors is an integer number (68864550).

Almost surely, 2^491716643 is an apocalyptic number.

491716643 is a deficient number, since it is larger than the sum of its proper divisors (59199757).

491716643 is a wasteful number, since it uses less digits than its factorization.

491716643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1208197.

The product of its digits is 108864, while the sum is 41.

The square root of 491716643 is about 22174.6847328209. The cubic root of 491716643 is about 789.2930935345.

The spelling of 491716643 in words is "four hundred ninety-one million, seven hundred sixteen thousand, six hundred forty-three".