8761661 has 4 divisors (see below), whose sum is σ = 8768352. Its totient is φ = 8754972.

The previous prime is 8761639. The next prime is 8761691. The reversal of 8761661 is 1661678.

8761661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1661678 = 2 ⋅830839.

It is a cyclic number.

It is not a de Polignac number, because 8761661 - 2²² = 4567357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8761601) 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, 665 + ... + 4238.

It is an arithmetic number, because the mean of its divisors is an integer number (2192088).

Almost surely, 2^8761661 is an apocalyptic number.

It is an amenable number.

8761661 is a deficient number, since it is larger than the sum of its proper divisors (6691).

8761661 is a wasteful number, since it uses less digits than its factorization.

8761661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6690.

The product of its digits is 12096, while the sum is 35.

The square root of 8761661 is about 2960.0103040361. The cubic root of 8761661 is about 206.1557639900.

The spelling of 8761661 in words is "eight million, seven hundred sixty-one thousand, six hundred sixty-one".