561537216241 has 4 divisors (see below), whose sum is σ = 563722186212. Its totient is φ = 559352246272.

The previous prime is 561537216223. The next prime is 561537216287. The reversal of 561537216241 is 142612735165.

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 419909184016 + 141628032225 = 648004^2 + 376335^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561537216241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561537216641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1092484600 + ... + 1092485113.

It is an arithmetic number, because the mean of its divisors is an integer number (140930546553).

Almost surely, 2^561537216241 is an apocalyptic number.

It is an amenable number.

561537216241 is a deficient number, since it is larger than the sum of its proper divisors (2184969971).

561537216241 is a wasteful number, since it uses less digits than its factorization.

561537216241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2184969970.

The product of its digits is 302400, while the sum is 43.

The spelling of 561537216241 in words is "five hundred sixty-one billion, five hundred thirty-seven million, two hundred sixteen thousand, two hundred forty-one".