2889661 has 4 divisors (see below), whose sum is σ = 2894400. Its totient is φ = 2884924.

The previous prime is 2889641. The next prime is 2889683. The reversal of 2889661 is 1669882.

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 an emirpimes, since its reverse is a distinct semiprime: 1669882 = 2 ⋅834941.

It is a cyclic number.

It is not a de Polignac number, because 2889661 - 2⁹ = 2889149 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2889641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1291 + ... + 2728.

It is an arithmetic number, because the mean of its divisors is an integer number (723600).

2^2889661 is an apocalyptic number.

It is an amenable number.

2889661 is a deficient number, since it is larger than the sum of its proper divisors (4739).

2889661 is an equidigital number, since it uses as much as digits as its factorization.

2889661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4738.

The product of its digits is 41472, while the sum is 40.

The square root of 2889661 is about 1699.9002911936. The cubic root of 2889661 is about 142.4346432619.

The spelling of 2889661 in words is "two million, eight hundred eighty-nine thousand, six hundred sixty-one".