821323147 has 2 divisors, whose sum is σ = 821323148. Its totient is φ = 821323146.

The previous prime is 821323117. The next prime is 821323163. The reversal of 821323147 is 741323128.

821323147 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-821323147 is a prime.

It is not a weakly prime, because it can be changed into another prime (821323117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410661573 + 410661574.

It is an arithmetic number, because the mean of its divisors is an integer number (410661574).

Almost surely, 2^821323147 is an apocalyptic number.

821323147 is a deficient number, since it is larger than the sum of its proper divisors (1).

821323147 is an equidigital number, since it uses as much as digits as its factorization.

821323147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 31.

The square root of 821323147 is about 28658.7359630532. The cubic root of 821323147 is about 936.4933277824.

The spelling of 821323147 in words is "eight hundred twenty-one million, three hundred twenty-three thousand, one hundred forty-seven".