8507661 has 4 divisors (see below), whose sum is σ = 11343552. Its totient is φ = 5671772.

The previous prime is 8507659. The next prime is 8507689. The reversal of 8507661 is 1667058.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8507661 - 2¹ = 8507659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8507651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1417941 + ... + 1417946.

It is an arithmetic number, because the mean of its divisors is an integer number (2835888).

Almost surely, 2^8507661 is an apocalyptic number.

It is an amenable number.

8507661 is a deficient number, since it is larger than the sum of its proper divisors (2835891).

8507661 is a wasteful number, since it uses less digits than its factorization.

8507661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2835890.

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 8507661 is about 2916.7895021753. The cubic root of 8507661 is about 204.1440495470.

The spelling of 8507661 in words is "eight million, five hundred seven thousand, six hundred sixty-one".