8221563509 has 8 divisors (see below), whose sum is σ = 8581989312. Its totient is φ = 7861384960.

The previous prime is 8221563491. The next prime is 8221563517. The reversal of 8221563509 is 9053651228.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8221563509 - 2¹² = 8221559413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8221563569) 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 in 7 ways as a sum of consecutive naturals, for example, 7829 + ... + 128469.

It is an arithmetic number, because the mean of its divisors is an integer number (1072748664).

Almost surely, 2^8221563509 is an apocalyptic number.

It is an amenable number.

8221563509 is a deficient number, since it is larger than the sum of its proper divisors (360425803).

8221563509 is a wasteful number, since it uses less digits than its factorization.

8221563509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123627.

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 8221563509 is about 90672.8377685401. The cubic root of 8221563509 is about 2018.2957481976.

The spelling of 8221563509 in words is "eight billion, two hundred twenty-one million, five hundred sixty-three thousand, five hundred nine".