8521065971 has 4 divisors (see below), whose sum is σ = 9295708344. Its totient is φ = 7746423600.

The previous prime is 8521065929. The next prime is 8521065979. The reversal of 8521065971 is 1795601258.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8521065971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8521065979) 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, 387321170 + ... + 387321191.

It is an arithmetic number, because the mean of its divisors is an integer number (2323927086).

Almost surely, 2^8521065971 is an apocalyptic number.

8521065971 is a deficient number, since it is larger than the sum of its proper divisors (774642373).

8521065971 is a wasteful number, since it uses less digits than its factorization.

8521065971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774642372.

The product of its (nonzero) digits is 151200, while the sum is 44.

The square root of 8521065971 is about 92309.6201432982. The cubic root of 8521065971 is about 2042.5121214062.

The spelling of 8521065971 in words is "eight billion, five hundred twenty-one million, sixty-five thousand, nine hundred seventy-one".