806509447 has 2 divisors, whose sum is σ = 806509448. Its totient is φ = 806509446.

The previous prime is 806509399. The next prime is 806509453. The reversal of 806509447 is 744905608.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-806509447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (806509477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 403254723 + 403254724.

It is an arithmetic number, because the mean of its divisors is an integer number (403254724).

Almost surely, 2^806509447 is an apocalyptic number.

806509447 is a deficient number, since it is larger than the sum of its proper divisors (1).

806509447 is an equidigital number, since it uses as much as digits as its factorization.

806509447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 806509447 is about 28399.1099684480. The cubic root of 806509447 is about 930.8288163863.

The spelling of 806509447 in words is "eight hundred six million, five hundred nine thousand, four hundred forty-seven".