8520809811 has 4 divisors (see below), whose sum is σ = 11361079752. Its totient is φ = 5680539872.

The previous prime is 8520809779. The next prime is 8520809821. The reversal of 8520809811 is 1189080258.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 8520809811 - 2⁵ = 8520809779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8520809821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1420134966 + ... + 1420134971.

It is an arithmetic number, because the mean of its divisors is an integer number (2840269938).

Almost surely, 2^8520809811 is an apocalyptic number.

8520809811 is a deficient number, since it is larger than the sum of its proper divisors (2840269941).

8520809811 is a wasteful number, since it uses less digits than its factorization.

8520809811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2840269940.

The product of its (nonzero) digits is 46080, while the sum is 42.

The square root of 8520809811 is about 92308.2326285148. The cubic root of 8520809811 is about 2042.4916538908.

The spelling of 8520809811 in words is "eight billion, five hundred twenty million, eight hundred nine thousand, eight hundred eleven".