8516521 has 8 divisors (see below), whose sum is σ = 9301824. Its totient is φ = 7749840.

The previous prime is 8516513. The next prime is 8516527. The reversal of 8516521 is 1256158.

8516521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 8516521 - 2³ = 8516513 is a prime.

It is a super-2 number, since 2×8516521² = 145062259886882, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8516521.

It is not an unprimeable number, because it can be changed into a prime (8516527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3691 + ... + 5536.

It is an arithmetic number, because the mean of its divisors is an integer number (1162728).

Almost surely, 2^8516521 is an apocalyptic number.

8516521 is the 1846-th heptagonal number.

It is an amenable number.

8516521 is a deficient number, since it is larger than the sum of its proper divisors (785303).

8516521 is a wasteful number, since it uses less digits than its factorization.

8516521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9311.

The product of its digits is 2400, while the sum is 28.

The square root of 8516521 is about 2918.3079001367. The cubic root of 8516521 is about 204.2148911398.

The spelling of 8516521 in words is "eight million, five hundred sixteen thousand, five hundred twenty-one".