561077729 has 2 divisors, whose sum is σ = 561077730. Its totient is φ = 561077728.

The previous prime is 561077701. The next prime is 561077767. The reversal of 561077729 is 927770165.

561077729 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., 366531025 + 194546704 = 19145^2 + 13948^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561077729 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 561077729.

It is not a weakly prime, because it can be changed into another prime (561077789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280538864 + 280538865.

It is an arithmetic number, because the mean of its divisors is an integer number (280538865).

Almost surely, 2^561077729 is an apocalyptic number.

It is an amenable number.

561077729 is a deficient number, since it is larger than the sum of its proper divisors (1).

561077729 is an equidigital number, since it uses as much as digits as its factorization.

561077729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 185220, while the sum is 44.

The square root of 561077729 is about 23687.0793682970. The cubic root of 561077729 is about 824.7854864378.

It can be divided in two parts, 56107 and 7729, that added together give a palindrome (63836).

The spelling of 561077729 in words is "five hundred sixty-one million, seventy-seven thousand, seven hundred twenty-nine".