809689577 has 2 divisors, whose sum is σ = 809689578. Its totient is φ = 809689576.

The previous prime is 809689547. The next prime is 809689637. The reversal of 809689577 is 775986908.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 477684736 + 332004841 = 21856^2 + 18221^2 .

It is a cyclic number.

It is not a de Polignac number, because 809689577 - 2²⁴ = 792912361 is a prime.

It is a super-2 number, since 2×809689577² = 1311194422204877858, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (809689547) 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, 404844788 + 404844789.

It is an arithmetic number, because the mean of its divisors is an integer number (404844789).

Almost surely, 2^809689577 is an apocalyptic number.

It is an amenable number.

809689577 is a deficient number, since it is larger than the sum of its proper divisors (1).

809689577 is an equidigital number, since it uses as much as digits as its factorization.

809689577 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7620480, while the sum is 59.

The square root of 809689577 is about 28455.0448426988. The cubic root of 809689577 is about 932.0506555293.

The spelling of 809689577 in words is "eight hundred nine million, six hundred eighty-nine thousand, five hundred seventy-seven".