8563535921 has 4 divisors (see below), whose sum is σ = 8565573744. Its totient is φ = 8561498100.

The previous prime is 8563535917. The next prime is 8563535933. The reversal of 8563535921 is 1295353658.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8563535921 - 2² = 8563535917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8563535941) 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, 1012595 + ... + 1021016.

It is an arithmetic number, because the mean of its divisors is an integer number (2141393436).

Almost surely, 2^8563535921 is an apocalyptic number.

It is an amenable number.

8563535921 is a deficient number, since it is larger than the sum of its proper divisors (2037823).

8563535921 is a wasteful number, since it uses less digits than its factorization.

8563535921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2037822.

The product of its digits is 972000, while the sum is 47.

The square root of 8563535921 is about 92539.3749762770. The cubic root of 8563535921 is about 2045.8998692711.

The spelling of 8563535921 in words is "eight billion, five hundred sixty-three million, five hundred thirty-five thousand, nine hundred twenty-one".