561908725 has 18 divisors (see below), whose sum is σ = 810526434. Its totient is φ = 385308000.

The previous prime is 561908723. The next prime is 561908729. The reversal of 561908725 is 527809165.

It can be written as a sum of positive squares in 3 ways, for example, as 127644804 + 434263921 = 11298^2 + 20839^2 .

It is not a de Polignac number, because 561908725 - 2¹ = 561908723 is a prime.

It is a super-2 number, since 2×561908725² = 631482830462251250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561908723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 228126 + ... + 230575.

Almost surely, 2^561908725 is an apocalyptic number.

It is an amenable number.

561908725 is a deficient number, since it is larger than the sum of its proper divisors (248617709).

561908725 is a wasteful number, since it uses less digits than its factorization.

561908725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458725 (or 458713 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 43.

The square root of 561908725 is about 23704.6140023414. The cubic root of 561908725 is about 825.1924742226.

The spelling of 561908725 in words is "five hundred sixty-one million, nine hundred eight thousand, seven hundred twenty-five".