2004661 has 2 divisors, whose sum is σ = 2004662. Its totient is φ = 2004660.

The previous prime is 2004647. The next prime is 2004679. The reversal of 2004661 is 1664002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1918225 + 86436 = 1385^2 + 294^2 .

It is a cyclic number.

It is not a de Polignac number, because 2004661 - 2¹¹ = 2002613 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2004601) 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 as a sum of consecutive naturals, namely, 1002330 + 1002331.

It is an arithmetic number, because the mean of its divisors is an integer number (1002331).

2^2004661 is an apocalyptic number.

It is an amenable number.

2004661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2004661 is an equidigital number, since it uses as much as digits as its factorization.

2004661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 2004661 is about 1415.8605157289. The cubic root of 2004661 is about 126.0899039222.

Adding to 2004661 its reverse (1664002), we get a palindrome (3668663).

The spelling of 2004661 in words is "two million, four thousand, six hundred sixty-one".