8210661 has 8 divisors (see below), whose sum is σ = 11127264. Its totient is φ = 5383920.

The previous prime is 8210659. The next prime is 8210663. The reversal of 8210661 is 1660128.

It is an interprime number because it is at equal distance from previous prime (8210659) and next prime (8210663).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8210661 - 2¹ = 8210659 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8210663) 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 7 ways as a sum of consecutive naturals, for example, 22251 + ... + 22616.

It is an arithmetic number, because the mean of its divisors is an integer number (1390908).

Almost surely, 2^8210661 is an apocalyptic number.

It is an amenable number.

8210661 is a deficient number, since it is larger than the sum of its proper divisors (2916603).

8210661 is a wasteful number, since it uses less digits than its factorization.

8210661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44931.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 8210661 is about 2865.4250993526. The cubic root of 8210661 is about 201.7403208260.

Adding to 8210661 its reverse (1660128), we get a palindrome (9870789).

The spelling of 8210661 in words is "eight million, two hundred ten thousand, six hundred sixty-one".