809238527969 has 2 divisors, whose sum is σ = 809238527970. Its totient is φ = 809238527968.

The previous prime is 809238527959. The next prime is 809238528023. The reversal of 809238527969 is 969725832908.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 777121587025 + 32116940944 = 881545^2 + 179212^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-809238527969 is a prime.

It is a super-2 number, since 2×809238527969² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 809238527899 and 809238527908.

It is not a weakly prime, because it can be changed into another prime (809238527959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404619263984 + 404619263985.

It is an arithmetic number, because the mean of its divisors is an integer number (404619263985).

Almost surely, 2^809238527969 is an apocalyptic number.

It is an amenable number.

809238527969 is a deficient number, since it is larger than the sum of its proper divisors (1).

809238527969 is an equidigital number, since it uses as much as digits as its factorization.

809238527969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 117573120, while the sum is 68.

The spelling of 809238527969 in words is "eight hundred nine billion, two hundred thirty-eight million, five hundred twenty-seven thousand, nine hundred sixty-nine".