491848871 has 2 divisors, whose sum is σ = 491848872. Its totient is φ = 491848870.

The previous prime is 491848849. The next prime is 491848873. The reversal of 491848871 is 178848194.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 491848871 - 2²² = 487654567 is a prime.

Together with 491848873, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491848873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245924435 + 245924436.

It is an arithmetic number, because the mean of its divisors is an integer number (245924436).

Almost surely, 2^491848871 is an apocalyptic number.

491848871 is a deficient number, since it is larger than the sum of its proper divisors (1).

491848871 is an equidigital number, since it uses as much as digits as its factorization.

491848871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 516096, while the sum is 50.

The square root of 491848871 is about 22177.6660404110. Note that the first 3 decimals coincide. The cubic root of 491848871 is about 789.3638370510.

The spelling of 491848871 in words is "four hundred ninety-one million, eight hundred forty-eight thousand, eight hundred seventy-one".