8505546409 has 2 divisors, whose sum is σ = 8505546410. Its totient is φ = 8505546408.

The previous prime is 8505546331. The next prime is 8505546449. The reversal of 8505546409 is 9046455058.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5920840809 + 2584705600 = 76947^2 + 50840^2 .

It is a cyclic number.

It is not a de Polignac number, because 8505546409 - 2⁷ = 8505546281 is a prime.

It is not a weakly prime, because it can be changed into another prime (8505546449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4252773204 + 4252773205.

It is an arithmetic number, because the mean of its divisors is an integer number (4252773205).

Almost surely, 2^8505546409 is an apocalyptic number.

It is an amenable number.

8505546409 is a deficient number, since it is larger than the sum of its proper divisors (1).

8505546409 is an equidigital number, since it uses as much as digits as its factorization.

8505546409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864000, while the sum is 46.

The square root of 8505546409 is about 92225.5192937400. The cubic root of 8505546409 is about 2041.2713471617.

The spelling of 8505546409 in words is "eight billion, five hundred five million, five hundred forty-six thousand, four hundred nine".