2561653 has 2 divisors, whose sum is σ = 2561654. Its totient is φ = 2561652.

The previous prime is 2561651. The next prime is 2561659. The reversal of 2561653 is 3561652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2289169 + 272484 = 1513^2 + 522^2 .

It is a cyclic number.

It is not a de Polignac number, because 2561653 - 2¹ = 2561651 is a prime.

Together with 2561651, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2561651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1280826 + 1280827.

It is an arithmetic number, because the mean of its divisors is an integer number (1280827).

2^2561653 is an apocalyptic number.

It is an amenable number.

2561653 is a deficient number, since it is larger than the sum of its proper divisors (1).

2561653 is an equidigital number, since it uses as much as digits as its factorization.

2561653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5400, while the sum is 28.

The square root of 2561653 is about 1600.5164791404. The cubic root of 2561653 is about 136.8275130475.

Subtracting 2561653 from its reverse (3561652), we obtain a palindrome (999999).

The spelling of 2561653 in words is "two million, five hundred sixty-one thousand, six hundred fifty-three".