8817145521 has 4 divisors (see below), whose sum is σ = 11756194032. Its totient is φ = 5878097012.

The previous prime is 8817145511. The next prime is 8817145543. The reversal of 8817145521 is 1255417188.

8817145521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a de Polignac number, because none of the positive numbers 2^k-8817145521 is a prime.

It is a super-2 number, since 2×8817145521² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8817145511) 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 3 ways as a sum of consecutive naturals, for example, 1469524251 + ... + 1469524256.

It is an arithmetic number, because the mean of its divisors is an integer number (2939048508).

Almost surely, 2^8817145521 is an apocalyptic number.

It is an amenable number.

8817145521 is a deficient number, since it is larger than the sum of its proper divisors (2939048511).

8817145521 is a wasteful number, since it uses less digits than its factorization.

8817145521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2939048510.

The product of its digits is 89600, while the sum is 42.

The square root of 8817145521 is about 93899.6566607142. The cubic root of 8817145521 is about 2065.9001928971.

The spelling of 8817145521 in words is "eight billion, eight hundred seventeen million, one hundred forty-five thousand, five hundred twenty-one".