8216081 has 4 divisors (see below), whose sum is σ = 8224692. Its totient is φ = 8207472.

The previous prime is 8216063. The next prime is 8216099. The reversal of 8216081 is 1806128.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (8216063) and next prime (8216099).

It can be written as a sum of positive squares in 2 ways, for example, as 7929856 + 286225 = 2816^2 + 535^2 .

It is a cyclic number.

It is not a de Polignac number, because 8216081 - 2⁶ = 8216017 is a prime.

It is a super-2 number, since 2×8216081² = 135007973997122, which contains 22 as substring.

It is an Ulam number.

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 8216081.

It is not an unprimeable number, because it can be changed into a prime (8246081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2666 + ... + 4851.

It is an arithmetic number, because the mean of its divisors is an integer number (2056173).

Almost surely, 2^8216081 is an apocalyptic number.

It is an amenable number.

8216081 is a deficient number, since it is larger than the sum of its proper divisors (8611).

8216081 is a wasteful number, since it uses less digits than its factorization.

8216081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8610.

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 8216081 is about 2866.3707017760. The cubic root of 8216081 is about 201.7847018256.

The spelling of 8216081 in words is "eight million, two hundred sixteen thousand, eighty-one".