561800749 has 2 divisors, whose sum is σ = 561800750. Its totient is φ = 561800748.

The previous prime is 561800741. The next prime is 561800779. The reversal of 561800749 is 947008165.

561800749 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 361380100 + 200420649 = 19010^2 + 14157^2 .

It is a cyclic number.

It is not a de Polignac number, because 561800749 - 2³ = 561800741 is a prime.

It is a super-3 number, since 3×561800749³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561800741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280900374 + 280900375.

It is an arithmetic number, because the mean of its divisors is an integer number (280900375).

Almost surely, 2^561800749 is an apocalyptic number.

It is an amenable number.

561800749 is a deficient number, since it is larger than the sum of its proper divisors (1).

561800749 is an equidigital number, since it uses as much as digits as its factorization.

561800749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 561800749 is about 23702.3363616332. The cubic root of 561800749 is about 825.1396146943.

The spelling of 561800749 in words is "five hundred sixty-one million, eight hundred thousand, seven hundred forty-nine".