823806871 has 2 divisors, whose sum is σ = 823806872. Its totient is φ = 823806870.

The previous prime is 823806869. The next prime is 823806889. The reversal of 823806871 is 178608328.

It is a happy number.

823806871 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 823806871 - 2¹ = 823806869 is a prime.

Together with 823806869, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (823806811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411903435 + 411903436.

It is an arithmetic number, because the mean of its divisors is an integer number (411903436).

Almost surely, 2^823806871 is an apocalyptic number.

823806871 is a deficient number, since it is larger than the sum of its proper divisors (1).

823806871 is an equidigital number, since it uses as much as digits as its factorization.

823806871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129024, while the sum is 43.

The square root of 823806871 is about 28702.0360079211. The cubic root of 823806871 is about 937.4363793508.

The spelling of 823806871 in words is "eight hundred twenty-three million, eight hundred six thousand, eight hundred seventy-one".