8286521 has 4 divisors (see below), whose sum is σ = 8299044. Its totient is φ = 8274000.

The previous prime is 8286511. The next prime is 8286541. The reversal of 8286521 is 1256828.

8286521 = 2035² + 2036².

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4141225 + 4145296 = 2035^2 + 2036^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8286521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8286511) 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, 5210 + ... + 6611.

It is an arithmetic number, because the mean of its divisors is an integer number (2074761).

Almost surely, 2^8286521 is an apocalyptic number.

8286521 is the 2036-th centered square number.

It is an amenable number.

8286521 is a deficient number, since it is larger than the sum of its proper divisors (12523).

8286521 is a wasteful number, since it uses less digits than its factorization.

8286521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12522.

The product of its digits is 7680, while the sum is 32.

The square root of 8286521 is about 2878.6317930573. The cubic root of 8286521 is about 202.3597240158.

The spelling of 8286521 in words is "eight million, two hundred eighty-six thousand, five hundred twenty-one".