821796863 has 2 divisors, whose sum is σ = 821796864. Its totient is φ = 821796862.

The previous prime is 821796817. The next prime is 821796893. The reversal of 821796863 is 368697128.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 821796863 - 2¹⁰ = 821795839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (821796803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410898431 + 410898432.

It is an arithmetic number, because the mean of its divisors is an integer number (410898432).

Almost surely, 2^821796863 is an apocalyptic number.

821796863 is a deficient number, since it is larger than the sum of its proper divisors (1).

821796863 is an equidigital number, since it uses as much as digits as its factorization.

821796863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 50.

The square root of 821796863 is about 28666.9995465169. Note that the first 3 decimals coincide. The cubic root of 821796863 is about 936.6733408141.

The spelling of 821796863 in words is "eight hundred twenty-one million, seven hundred ninety-six thousand, eight hundred sixty-three".