8661005 has 8 divisors (see below), whose sum is σ = 10457952. Its totient is φ = 6885648.

The previous prime is 8661001. The next prime is 8661043. The reversal of 8661005 is 5001668.

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

It is a cyclic number.

It is not a de Polignac number, because 8661005 - 2² = 8661001 is a prime.

It is a super-2 number, since 2×8661005² = 150026015220050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8661001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4499 + ... + 6128.

It is an arithmetic number, because the mean of its divisors is an integer number (1307244).

Almost surely, 2^8661005 is an apocalyptic number.

It is an amenable number.

8661005 is a deficient number, since it is larger than the sum of its proper divisors (1796947).

8661005 is a wasteful number, since it uses less digits than its factorization.

8661005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10795.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 8661005 is about 2942.9585454097. The cubic root of 8661005 is about 205.3632662716.

The spelling of 8661005 in words is "eight million, six hundred sixty-one thousand, five".