8709661 has 4 divisors (see below), whose sum is σ = 9222012. Its totient is φ = 8197312.

The previous prime is 8709653. The next prime is 8709677. The reversal of 8709661 is 1669078.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3276100 + 5433561 = 1810^2 + 2331^2 .

It is a cyclic number.

It is not a de Polignac number, because 8709661 - 2³ = 8709653 is a prime.

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 8709661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8709611) 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 3 ways as a sum of consecutive naturals, for example, 256150 + ... + 256183.

It is an arithmetic number, because the mean of its divisors is an integer number (2305503).

Almost surely, 2^8709661 is an apocalyptic number.

It is an amenable number.

8709661 is a deficient number, since it is larger than the sum of its proper divisors (512351).

8709661 is a wasteful number, since it uses less digits than its factorization.

8709661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512350.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 8709661 is about 2951.2134792319. The cubic root of 8709661 is about 205.7471132530.

The spelling of 8709661 in words is "eight million, seven hundred nine thousand, six hundred sixty-one".