8811661 has 8 divisors (see below), whose sum is σ = 9582840. Its totient is φ = 8068608.

The previous prime is 8811659. The next prime is 8811667. The reversal of 8811661 is 1661188.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5593225 + 3218436 = 2365^2 + 1794^2 .

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

It is not a de Polignac number, because 8811661 - 2¹ = 8811659 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 (8811667) 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 7 ways as a sum of consecutive naturals, for example, 6376 + ... + 7633.

It is an arithmetic number, because the mean of its divisors is an integer number (1197855).

Almost surely, 2^8811661 is an apocalyptic number.

It is an amenable number.

8811661 is a deficient number, since it is larger than the sum of its proper divisors (771179).

8811661 is a wasteful number, since it uses less digits than its factorization.

8811661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14063.

The product of its digits is 2304, while the sum is 31.

The square root of 8811661 is about 2968.4442053035. Note that the first 3 decimals coincide. The cubic root of 8811661 is about 206.5471754046.

The spelling of 8811661 in words is "eight million, eight hundred eleven thousand, six hundred sixty-one".