561552773 has 2 divisors, whose sum is σ = 561552774. Its totient is φ = 561552772.

The previous prime is 561552743. The next prime is 561552907. The reversal of 561552773 is 377255165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 450840289 + 110712484 = 21233^2 + 10522^2 .

It is a cyclic number.

It is not a de Polignac number, because 561552773 - 2¹² = 561548677 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 561552773.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561552743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280776386 + 280776387.

It is an arithmetic number, because the mean of its divisors is an integer number (280776387).

Almost surely, 2^561552773 is an apocalyptic number.

It is an amenable number.

561552773 is a deficient number, since it is larger than the sum of its proper divisors (1).

561552773 is an equidigital number, since it uses as much as digits as its factorization.

561552773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 220500, while the sum is 41.

The square root of 561552773 is about 23697.1047387650. The cubic root of 561552773 is about 825.0181926812.

The spelling of 561552773 in words is "five hundred sixty-one million, five hundred fifty-two thousand, seven hundred seventy-three".