809605219651 has 2 divisors, whose sum is σ = 809605219652. Its totient is φ = 809605219650.

The previous prime is 809605219601. The next prime is 809605219663. The reversal of 809605219651 is 156912506908.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 809605219651 - 2¹⁹ = 809604695363 is a prime.

It is a super-2 number, since 2×809605219651² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (809605219601) 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, 404802609825 + 404802609826.

It is an arithmetic number, because the mean of its divisors is an integer number (404802609826).

Almost surely, 2^809605219651 is an apocalyptic number.

809605219651 is a deficient number, since it is larger than the sum of its proper divisors (1).

809605219651 is an equidigital number, since it uses as much as digits as its factorization.

809605219651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1166400, while the sum is 52.

The spelling of 809605219651 in words is "eight hundred nine billion, six hundred five million, two hundred nineteen thousand, six hundred fifty-one".