8521687 has 2 divisors, whose sum is σ = 8521688. Its totient is φ = 8521686.

The previous prime is 8521649. The next prime is 8521699. The reversal of 8521687 is 7861258.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8521687 - 2¹⁵ = 8488919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8521787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4260843 + 4260844.

It is an arithmetic number, because the mean of its divisors is an integer number (4260844).

Almost surely, 2^8521687 is an apocalyptic number.

8521687 is a deficient number, since it is larger than the sum of its proper divisors (1).

8521687 is an equidigital number, since it uses as much as digits as its factorization.

8521687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26880, while the sum is 37.

The square root of 8521687 is about 2919.1928679003. The cubic root of 8521687 is about 204.2561740724.

The spelling of 8521687 in words is "eight million, five hundred twenty-one thousand, six hundred eighty-seven".