2600561 has 2 divisors, whose sum is σ = 2600562. Its totient is φ = 2600560.

The previous prime is 2600531. The next prime is 2600567. The reversal of 2600561 is 1650062.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1537600 + 1062961 = 1240^2 + 1031^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2600561 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2600567) 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, 1300280 + 1300281.

It is an arithmetic number, because the mean of its divisors is an integer number (1300281).

2^2600561 is an apocalyptic number.

It is an amenable number.

2600561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2600561 is an equidigital number, since it uses as much as digits as its factorization.

2600561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 2600561 is about 1612.6254989922. The cubic root of 2600561 is about 137.5167759146.

The spelling of 2600561 in words is "two million, six hundred thousand, five hundred sixty-one".