2561225 has 12 divisors (see below), whose sum is σ = 3237516. Its totient is φ = 2009280.

The previous prime is 2561201. The next prime is 2561227. The reversal of 2561225 is 5221652.

It can be written as a sum of positive squares in 6 ways, for example, as 10816 + 2550409 = 104^2 + 1597^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2561225 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2561225.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2561227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 359 + ... + 2291.

It is an arithmetic number, because the mean of its divisors is an integer number (269793).

2^2561225 is an apocalyptic number.

2561225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2561225 is a deficient number, since it is larger than the sum of its proper divisors (676291).

2561225 is a wasteful number, since it uses less digits than its factorization.

2561225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1996 (or 1991 counting only the distinct ones).

The product of its digits is 1200, while the sum is 23.

The square root of 2561225 is about 1600.3827667155. The cubic root of 2561225 is about 136.8198922602.

Adding to 2561225 its reverse (5221652), we get a palindrome (7782877).

It can be divided in two parts, 256 and 1225, that multiplied together give a square (313600 = 560²).

The spelling of 2561225 in words is "two million, five hundred sixty-one thousand, two hundred twenty-five".