561729841 has 2 divisors, whose sum is σ = 561729842. Its totient is φ = 561729840.

The previous prime is 561729821. The next prime is 561729911. The reversal of 561729841 is 148927165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 529000000 + 32729841 = 23000^2 + 5721^2 .

It is a cyclic number.

It is not a de Polignac number, because 561729841 - 2¹⁷ = 561598769 is a prime.

It is not a weakly prime, because it can be changed into another prime (561729811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280864920 + 280864921.

It is an arithmetic number, because the mean of its divisors is an integer number (280864921).

Almost surely, 2^561729841 is an apocalyptic number.

It is an amenable number.

561729841 is a deficient number, since it is larger than the sum of its proper divisors (1).

561729841 is an equidigital number, since it uses as much as digits as its factorization.

561729841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 43.

The square root of 561729841 is about 23700.8405125219. The cubic root of 561729841 is about 825.1048980789.

The spelling of 561729841 in words is "five hundred sixty-one million, seven hundred twenty-nine thousand, eight hundred forty-one".