2653561 has 8 divisors (see below), whose sum is σ = 2765448. Its totient is φ = 2544000.

The previous prime is 2653549. The next prime is 2653571. The reversal of 2653561 is 1653562.

It can be written as a sum of positive squares in 4 ways, for example, as 32400 + 2621161 = 180^2 + 1619^2 .

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 2653561 - 2⁷ = 2653433 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2653571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1971 + ... + 3031.

It is an arithmetic number, because the mean of its divisors is an integer number (345681).

2^2653561 is an apocalyptic number.

2653561 is the 729-th centered decagonal number.

It is an amenable number.

2653561 is a deficient number, since it is larger than the sum of its proper divisors (111887).

2653561 is a wasteful number, since it uses less digits than its factorization.

2653561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1163.

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

The square root of 2653561 is about 1628.9754448732. The cubic root of 2653561 is about 138.4447076487. Note that the first 3 decimals are identical.

Subtracting from 2653561 its reverse (1653562), we obtain a palindrome (999999).

The spelling of 2653561 in words is "two million, six hundred fifty-three thousand, five hundred sixty-one".