491838847 has 4 divisors (see below), whose sum is σ = 496351240. Its totient is φ = 487326456.

The previous prime is 491838833. The next prime is 491838871. The reversal of 491838847 is 748838194.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 491838847 - 2¹¹ = 491836799 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 491838794 and 491838803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491835847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2256033 + ... + 2256250.

It is an arithmetic number, because the mean of its divisors is an integer number (124087810).

Almost surely, 2^491838847 is an apocalyptic number.

491838847 is a deficient number, since it is larger than the sum of its proper divisors (4512393).

491838847 is a wasteful number, since it uses less digits than its factorization.

491838847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4512392.

The product of its digits is 1548288, while the sum is 52.

The square root of 491838847 is about 22177.4400461370. The cubic root of 491838847 is about 789.3584745387.

The spelling of 491838847 in words is "four hundred ninety-one million, eight hundred thirty-eight thousand, eight hundred forty-seven".