561901729 has 4 divisors (see below), whose sum is σ = 562142484. Its totient is φ = 561660976.

The previous prime is 561901723. The next prime is 561901733. The reversal of 561901729 is 927109165.

561901729 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 927109165 = 5 ⋅185421833.

It can be written as a sum of positive squares in 2 ways, for example, as 64834704 + 497067025 = 8052^2 + 22295^2 .

It is a cyclic number.

It is not a de Polignac number, because 561901729 - 2¹⁹ = 561377441 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 561901691 and 561901700.

It is not an unprimeable number, because it can be changed into a prime (561901723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116842 + ... + 121555.

It is an arithmetic number, because the mean of its divisors is an integer number (140535621).

Almost surely, 2^561901729 is an apocalyptic number.

It is an amenable number.

561901729 is a deficient number, since it is larger than the sum of its proper divisors (240755).

561901729 is a wasteful number, since it uses less digits than its factorization.

561901729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240754.

The product of its (nonzero) digits is 34020, while the sum is 40.

The square root of 561901729 is about 23704.4664356741. The cubic root of 561901729 is about 825.1890495439.

The spelling of 561901729 in words is "five hundred sixty-one million, nine hundred one thousand, seven hundred twenty-nine".