491729646047 has 4 divisors (see below), whose sum is σ = 491748482856. Its totient is φ = 491710809240.

The previous prime is 491729646029. The next prime is 491729646137. The reversal of 491729646047 is 740646927194.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 740646927194 = 2 ⋅370323463597.

It is a cyclic number.

It is not a de Polignac number, because 491729646047 - 2²⁴ = 491712868831 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 (491729646017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9379193 + ... + 9431474.

It is an arithmetic number, because the mean of its divisors is an integer number (122937120714).

Almost surely, 2^491729646047 is an apocalyptic number.

491729646047 is a deficient number, since it is larger than the sum of its proper divisors (18836809).

491729646047 is a wasteful number, since it uses less digits than its factorization.

491729646047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18836808.

The product of its (nonzero) digits is 18289152, while the sum is 59.

The spelling of 491729646047 in words is "four hundred ninety-one billion, seven hundred twenty-nine million, six hundred forty-six thousand, forty-seven".