2563561 has 24 divisors (see below), whose sum is σ = 3478464. Its totient is φ = 1834560.

The previous prime is 2563553. The next prime is 2563601. The reversal of 2563561 is 1653652.

It is not a de Polignac number, because 2563561 - 2³ = 2563553 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2563261) 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 23 ways as a sum of consecutive naturals, for example, 12915 + ... + 13111.

It is an arithmetic number, because the mean of its divisors is an integer number (144936).

2^2563561 is an apocalyptic number.

It is an amenable number.

2563561 is a deficient number, since it is larger than the sum of its proper divisors (914903).

2563561 is a wasteful number, since it uses less digits than its factorization.

2563561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241 (or 228 counting only the distinct ones).

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

The square root of 2563561 is about 1601.1124257840. The cubic root of 2563561 is about 136.8614757667.

Subtracting from 2563561 its reverse (1653652), we obtain a palindrome (909909).

The spelling of 2563561 in words is "two million, five hundred sixty-three thousand, five hundred sixty-one".