491196643 has 8 divisors (see below), whose sum is σ = 579476480. Its totient is φ = 407444040.

The previous prime is 491196617. The next prime is 491196703. The reversal of 491196643 is 346691194.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491196643 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 491196643.

It is not an unprimeable number, because it can be changed into a prime (491196143) 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, 1131573 + ... + 1132006.

It is an arithmetic number, because the mean of its divisors is an integer number (72434560).

Almost surely, 2^491196643 is an apocalyptic number.

491196643 is a deficient number, since it is larger than the sum of its proper divisors (88279837).

491196643 is a wasteful number, since it uses less digits than its factorization.

491196643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2263617.

The product of its digits is 139968, while the sum is 43.

The square root of 491196643 is about 22162.9565491610. The cubic root of 491196643 is about 789.0147644197.

The spelling of 491196643 in words is "four hundred ninety-one million, one hundred ninety-six thousand, six hundred forty-three".