2658561 has 16 divisors (see below), whose sum is σ = 3731904. Its totient is φ = 1681344.

The previous prime is 2658559. The next prime is 2658569. The reversal of 2658561 is 1658562.

It is not a de Polignac number, because 2658561 - 2¹ = 2658559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2658569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4495 + ... + 5051.

It is an arithmetic number, because the mean of its divisors is an integer number (233244).

2^2658561 is an apocalyptic number.

It is an amenable number.

2658561 is a deficient number, since it is larger than the sum of its proper divisors (1073343).

2658561 is a wasteful number, since it uses less digits than its factorization.

2658561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640.

The product of its digits is 14400, while the sum is 33.

The square root of 2658561 is about 1630.5094295955. The cubic root of 2658561 is about 138.5316083853.

Subtracting from 2658561 its reverse (1658562), we obtain a palindrome (999999).

The spelling of 2658561 in words is "two million, six hundred fifty-eight thousand, five hundred sixty-one".