2646561 has 4 divisors (see below), whose sum is σ = 3528752. Its totient is φ = 1764372.

The previous prime is 2646551. The next prime is 2646571. The reversal of 2646561 is 1656462.

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 an interprime number because it is at equal distance from previous prime (2646551) and next prime (2646571).

It is not a de Polignac number, because 2646561 - 2¹¹ = 2644513 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2646551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 441091 + ... + 441096.

It is an arithmetic number, because the mean of its divisors is an integer number (882188).

2^2646561 is an apocalyptic number.

It is an amenable number.

2646561 is a deficient number, since it is larger than the sum of its proper divisors (882191).

2646561 is an equidigital number, since it uses as much as digits as its factorization.

2646561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 882190.

The product of its digits is 8640, while the sum is 30.

The square root of 2646561 is about 1626.8254362408. The cubic root of 2646561 is about 138.3228630323.

Subtracting from 2646561 its reverse (1656462), we obtain a palindrome (990099).

The spelling of 2646561 in words is "two million, six hundred forty-six thousand, five hundred sixty-one".