809317087 has 2 divisors, whose sum is σ = 809317088. Its totient is φ = 809317086.

The previous prime is 809317057. The next prime is 809317127. The reversal of 809317087 is 780713908.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-809317087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (809317037) 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, 404658543 + 404658544.

It is an arithmetic number, because the mean of its divisors is an integer number (404658544).

Almost surely, 2^809317087 is an apocalyptic number.

809317087 is a deficient number, since it is larger than the sum of its proper divisors (1).

809317087 is an equidigital number, since it uses as much as digits as its factorization.

809317087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84672, while the sum is 43.

The square root of 809317087 is about 28448.4988531908. The cubic root of 809317087 is about 931.9077065889.

The spelling of 809317087 in words is "eight hundred nine million, three hundred seventeen thousand, eighty-seven".