561922930721 has 2 divisors, whose sum is σ = 561922930722. Its totient is φ = 561922930720.

The previous prime is 561922930693. The next prime is 561922930727. The reversal of 561922930721 is 127039229165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 376368753121 + 185554177600 = 613489^2 + 430760^2 .

It is a cyclic number.

It is not a de Polignac number, because 561922930721 - 2¹⁸ = 561922668577 is a prime.

It is not a weakly prime, because it can be changed into another prime (561922930727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280961465360 + 280961465361.

It is an arithmetic number, because the mean of its divisors is an integer number (280961465361).

Almost surely, 2^561922930721 is an apocalyptic number.

It is an amenable number.

561922930721 is a deficient number, since it is larger than the sum of its proper divisors (1).

561922930721 is an equidigital number, since it uses as much as digits as its factorization.

561922930721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 408240, while the sum is 47.

The spelling of 561922930721 in words is "five hundred sixty-one billion, nine hundred twenty-two million, nine hundred thirty thousand, seven hundred twenty-one".