809238527999 has 12 divisors (see below), whose sum is σ = 889588279440. Its totient is φ = 735593073600.

The previous prime is 809238527969. The next prime is 809238528023. The reversal of 809238527999 is 999725832908.

It is a de Polignac number, because none of the positive numbers 2^k-809238527999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809238527959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 800822 + ... + 1503260.

It is an arithmetic number, because the mean of its divisors is an integer number (74132356620).

Almost surely, 2^809238527999 is an apocalyptic number.

809238527999 is a deficient number, since it is larger than the sum of its proper divisors (80349751441).

809238527999 is a wasteful number, since it uses less digits than its factorization.

809238527999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711982 (or 711971 counting only the distinct ones).

The product of its (nonzero) digits is 176359680, while the sum is 71.

The spelling of 809238527999 in words is "eight hundred nine billion, two hundred thirty-eight million, five hundred twenty-seven thousand, nine hundred ninety-nine".