561507438244 has 9 divisors (see below), whose sum is σ = 982640639617. Its totient is φ = 280752969784.

The previous prime is 561507438241. The next prime is 561507438259. The reversal of 561507438244 is 442834705165.

The square root of 561507438244 is 749338.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 413528735844 + 147978702400 = 643062^2 + 384680^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561507438241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1311342 + ... + 1686010.

Almost surely, 2^561507438244 is an apocalyptic number.

561507438244 is the 749338-th square number.

It is an amenable number.

561507438244 is a deficient number, since it is larger than the sum of its proper divisors (421133201373).

561507438244 is an frugal number, since it uses more digits than its factorization.

561507438244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 749342 (or 374671 counting only the distinct ones).

The product of its (nonzero) digits is 3225600, while the sum is 49.

Multiplying 561507438244 by its sum of digits (49), we get a square (27513864473956 = 5245366²).

The spelling of 561507438244 in words is "five hundred sixty-one billion, five hundred seven million, four hundred thirty-eight thousand, two hundred forty-four".