2656561 has 8 divisors (see below), whose sum is σ = 2829600. Its totient is φ = 2486880.

The previous prime is 2656553. The next prime is 2656601. The reversal of 2656561 is 1656562.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2656561 - 2³ = 2656553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2656501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 906 + ... + 2476.

It is an arithmetic number, because the mean of its divisors is an integer number (353700).

2^2656561 is an apocalyptic number.

It is an amenable number.

2656561 is a deficient number, since it is larger than the sum of its proper divisors (173039).

2656561 is a wasteful number, since it uses less digits than its factorization.

2656561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1679.

The product of its digits is 10800, while the sum is 31.

The square root of 2656561 is about 1629.8960089527. The cubic root of 2656561 is about 138.4968611765.

Subtracting from 2656561 its reverse (1656562), we obtain a palindrome (999999).

The spelling of 2656561 in words is "two million, six hundred fifty-six thousand, five hundred sixty-one".