8216559 has 48 divisors (see below), whose sum is σ = 14097440. Its totient is φ = 4758912.

The previous prime is 8216557. The next prime is 8216561. The reversal of 8216559 is 9556128.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (8216557) and next prime (8216561).

It is not a de Polignac number, because 8216559 - 2¹ = 8216557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8216557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 483319 + ... + 483335.

Almost surely, 2^8216559 is an apocalyptic number.

8216559 is a deficient number, since it is larger than the sum of its proper divisors (5880881).

8216559 is an equidigital number, since it uses as much as digits as its factorization.

8216559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68 (or 33 counting only the distinct ones).

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

The square root of 8216559 is about 2866.4540812649. The cubic root of 8216559 is about 201.7886149328.

It can be divided in two parts, 82 and 16559, that added together give a square (16641 = 129²).

The spelling of 8216559 in words is "eight million, two hundred sixteen thousand, five hundred fifty-nine".