561245 has 4 divisors (see below), whose sum is σ = 673500. Its totient is φ = 448992.

The previous prime is 561229. The next prime is 561251. The reversal of 561245 is 542165.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 383161 + 178084 = 619^2 + 422^2 .

It is a cyclic number.

It is not a de Polignac number, because 561245 - 2⁴ = 561229 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 561245.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56120 + ... + 56129.

It is an arithmetic number, because the mean of its divisors is an integer number (168375).

2⁵⁶¹²⁴⁵ is an apocalyptic number.

It is an amenable number.

561245 is a deficient number, since it is larger than the sum of its proper divisors (112255).

561245 is a wasteful number, since it uses less digits than its factorization.

561245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112254.

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

The square root of 561245 is about 749.1628661379. The cubic root of 561245 is about 82.4867441206.

The spelling of 561245 in words is "five hundred sixty-one thousand, two hundred forty-five".