491197823999 has 8 divisors (see below), whose sum is σ = 520297347888. Its totient is φ = 462121137280.

The previous prime is 491197823993. The next prime is 491197824043. The reversal of 491197823999 is 999328791194.

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-491197823999 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 (491197823993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5664992 + ... + 5751045.

It is an arithmetic number, because the mean of its divisors is an integer number (65037168486).

Almost surely, 2^491197823999 is an apocalyptic number.

491197823999 is a deficient number, since it is larger than the sum of its proper divisors (29099523889).

491197823999 is a wasteful number, since it uses less digits than its factorization.

491197823999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11418585.

The product of its digits is 79361856, while the sum is 71.

The spelling of 491197823999 in words is "four hundred ninety-one billion, one hundred ninety-seven million, eight hundred twenty-three thousand, nine hundred ninety-nine".