561077789 has 2 divisors, whose sum is σ = 561077790.
Its totient is φ = 561077788.
The previous prime is 561077767. The next prime is 561077791. The reversal of 561077789 is 987770165.
561077789 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 351262564 + 209815225 = 18742^2 + 14485^2
It is a cyclic number.
It is not a de Polignac number, because 561077789 - 220 = 560029213 is a prime.
Together with 561077791, it forms a pair of twin primes.
It is a Chen prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (561077729) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280538894 + 280538895.
It is an arithmetic number, because the mean of its divisors is an integer number (280538895).
Almost surely, 2561077789 is an apocalyptic number.
It is an amenable number.
561077789 is a deficient number, since it is larger than the sum of its proper divisors (1).
561077789 is an equidigital number, since it uses as much as digits as its factorization.
561077789 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 740880, while the sum is 50.
The square root of 561077789 is about 23687.0806348102.
The cubic root of 561077789 is about 824.7855158378.
The spelling of 561077789 in words is "five hundred sixty-one million, seventy-seven thousand, seven hundred eighty-nine".