806670509 has 2 divisors, whose sum is σ = 806670510. Its totient is φ = 806670508.

The previous prime is 806670503. The next prime is 806670533. The reversal of 806670509 is 905076608.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 806389609 + 280900 = 28397^2 + 530^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-806670509 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (806670503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 403335254 + 403335255.

It is an arithmetic number, because the mean of its divisors is an integer number (403335255).

Almost surely, 2^806670509 is an apocalyptic number.

It is an amenable number.

806670509 is a deficient number, since it is larger than the sum of its proper divisors (1).

806670509 is an equidigital number, since it uses as much as digits as its factorization.

806670509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 806670509 is about 28401.9455143481. The cubic root of 806670509 is about 930.8907752274.

The spelling of 806670509 in words is "eight hundred six million, six hundred seventy thousand, five hundred nine".