8521659 has 8 divisors (see below), whose sum is σ = 12624720. Its totient is φ = 5681088.

The previous prime is 8521649. The next prime is 8521687. The reversal of 8521659 is 9561258.

It is a happy number.

It is not a de Polignac number, because 8521659 - 2¹² = 8517563 is a prime.

It is a super-2 number, since 2×8521659² = 145237344224562, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8521619) 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 in 7 ways as a sum of consecutive naturals, for example, 157782 + ... + 157835.

It is an arithmetic number, because the mean of its divisors is an integer number (1578090).

Almost surely, 2^8521659 is an apocalyptic number.

8521659 is a deficient number, since it is larger than the sum of its proper divisors (4103061).

8521659 is a wasteful number, since it uses less digits than its factorization.

8521659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315626 (or 315620 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 8521659 is about 2919.1880720502. The cubic root of 8521659 is about 204.2559503617.

It can be divided in two parts, 8521 and 659, that added together give a triangular number (9180 = T₁₃₅).

The spelling of 8521659 in words is "eight million, five hundred twenty-one thousand, six hundred fifty-nine".