561225 has 24 divisors (see below), whose sum is σ = 1061440. Its totient is φ = 256320.

The previous prime is 561199. The next prime is 561229. The reversal of 561225 is 522165.

561225 = 168² + 169² + ... + 185².

It is not a de Polignac number, because 561225 - 2⁶ = 561161 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (561229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10 + ... + 1059.

2⁵⁶¹²²⁵ is an apocalyptic number.

It is an amenable number.

561225 is a deficient number, since it is larger than the sum of its proper divisors (500215).

561225 is a wasteful number, since it uses less digits than its factorization.

561225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1089 (or 1084 counting only the distinct ones).

The product of its digits is 600, while the sum is 21.

The square root of 561225 is about 749.1495177867. The cubic root of 561225 is about 82.4857643022.

Subtracting from 561225 its reverse (522165), we obtain a triangular number (39060 = T₂₇₉).

The spelling of 561225 in words is "five hundred sixty-one thousand, two hundred twenty-five".