806217647 has 2 divisors, whose sum is σ = 806217648. Its totient is φ = 806217646.

The previous prime is 806217619. The next prime is 806217667. The reversal of 806217647 is 746712608.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 806217647 - 2¹⁸ = 805955503 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (806217617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 403108823 + 403108824.

It is an arithmetic number, because the mean of its divisors is an integer number (403108824).

Almost surely, 2^806217647 is an apocalyptic number.

806217647 is a deficient number, since it is larger than the sum of its proper divisors (1).

806217647 is an equidigital number, since it uses as much as digits as its factorization.

806217647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 806217647 is about 28393.9720187226. The cubic root of 806217647 is about 930.7165430114.

The spelling of 806217647 in words is "eight hundred six million, two hundred seventeen thousand, six hundred forty-seven".