2204561 has 2 divisors, whose sum is σ = 2204562. Its totient is φ = 2204560.

The previous prime is 2204557. The next prime is 2204591. The reversal of 2204561 is 1654022.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2190400 + 14161 = 1480^2 + 119^2 .

It is a cyclic number.

It is not a de Polignac number, because 2204561 - 2² = 2204557 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 (2204591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1102280 + 1102281.

It is an arithmetic number, because the mean of its divisors is an integer number (1102281).

2^2204561 is an apocalyptic number.

It is an amenable number.

2204561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2204561 is an equidigital number, since it uses as much as digits as its factorization.

2204561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 2204561 is about 1484.7764141446. The cubic root of 2204561 is about 130.1489613963.

Adding to 2204561 its reverse (1654022), we get a palindrome (3858583).

The spelling of 2204561 in words is "two million, two hundred four thousand, five hundred sixty-one".