561240725 has 12 divisors (see below), whose sum is σ = 696564420. Its totient is φ = 448588800.

The previous prime is 561240707. The next prime is 561240749. The reversal of 561240725 is 527042165.

It can be written as a sum of positive squares in 6 ways, for example, as 46812964 + 514427761 = 6842^2 + 22681^2 .

It is not a de Polignac number, because 561240725 - 2⁸ = 561240469 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 561240691 and 561240700.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20021 + ... + 39029.

It is an arithmetic number, because the mean of its divisors is an integer number (58047035).

Almost surely, 2^561240725 is an apocalyptic number.

It is an amenable number.

561240725 is a deficient number, since it is larger than the sum of its proper divisors (135323695).

561240725 is a wasteful number, since it uses less digits than its factorization.

561240725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20200 (or 20195 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 561240725 is about 23690.5197283639. The cubic root of 561240725 is about 824.8653468636.

The spelling of 561240725 in words is "five hundred sixty-one million, two hundred forty thousand, seven hundred twenty-five".