8665521 has 4 divisors (see below), whose sum is σ = 11554032. Its totient is φ = 5777012.

The previous prime is 8665499. The next prime is 8665541. The reversal of 8665521 is 1255668.

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 8665521 - 2²² = 4471217 is a prime.

It is a Curzon number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (8665541) 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, 1444251 + ... + 1444256.

It is an arithmetic number, because the mean of its divisors is an integer number (2888508).

Almost surely, 2^8665521 is an apocalyptic number.

It is an amenable number.

8665521 is a deficient number, since it is larger than the sum of its proper divisors (2888511).

8665521 is a wasteful number, since it uses less digits than its factorization.

8665521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2888510.

The product of its digits is 14400, while the sum is 33.

The square root of 8665521 is about 2943.7257005367. The cubic root of 8665521 is about 205.3989534067.

The spelling of 8665521 in words is "eight million, six hundred sixty-five thousand, five hundred twenty-one".