2606561 has 4 divisors (see below), whose sum is σ = 2650800. Its totient is φ = 2562324.

The previous prime is 2606551. The next prime is 2606579. The reversal of 2606561 is 1656062.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2606561 - 2⁶ = 2606497 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2606561.

It is not an unprimeable number, because it can be changed into a prime (2606551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22031 + ... + 22148.

It is an arithmetic number, because the mean of its divisors is an integer number (662700).

2^2606561 is an apocalyptic number.

It is an amenable number.

2606561 is a deficient number, since it is larger than the sum of its proper divisors (44239).

2606561 is an equidigital number, since it uses as much as digits as its factorization.

2606561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44238.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 2606561 is about 1614.4847475278. The cubic root of 2606561 is about 137.6224539986.

The spelling of 2606561 in words is "two million, six hundred six thousand, five hundred sixty-one".