2608561 has 2 divisors, whose sum is σ = 2608562. Its totient is φ = 2608560.

The previous prime is 2608559. The next prime is 2608577. The reversal of 2608561 is 1658062.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1440000 + 1168561 = 1200^2 + 1081^2 .

It is a cyclic number.

It is not a de Polignac number, because 2608561 - 2¹ = 2608559 is a prime.

Together with 2608559, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2608861) 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, 1304280 + 1304281.

It is an arithmetic number, because the mean of its divisors is an integer number (1304281).

2^2608561 is an apocalyptic number.

It is an amenable number.

2608561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2608561 is an equidigital number, since it uses as much as digits as its factorization.

2608561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 2608561 is about 1615.1040214178. The cubic root of 2608561 is about 137.6576439852.

The spelling of 2608561 in words is "two million, six hundred eight thousand, five hundred sixty-one".