844864871 has 2 divisors, whose sum is σ = 844864872. Its totient is φ = 844864870.

The previous prime is 844864763. The next prime is 844864873. The reversal of 844864871 is 178468448.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 844864871 - 2¹⁸ = 844602727 is a prime.

Together with 844864873, 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 (844864873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422432435 + 422432436.

It is an arithmetic number, because the mean of its divisors is an integer number (422432436).

Almost surely, 2^844864871 is an apocalyptic number.

844864871 is a deficient number, since it is larger than the sum of its proper divisors (1).

844864871 is an equidigital number, since it uses as much as digits as its factorization.

844864871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1376256, while the sum is 50.

The square root of 844864871 is about 29066.5593251076. The cubic root of 844864871 is about 945.3567966735.

The spelling of 844864871 in words is "eight hundred forty-four million, eight hundred sixty-four thousand, eight hundred seventy-one".