561544549 has 2 divisors, whose sum is σ = 561544550. Its totient is φ = 561544548.

The previous prime is 561544537. The next prime is 561544553. The reversal of 561544549 is 945445165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 411359524 + 150185025 = 20282^2 + 12255^2 .

It is a cyclic number.

It is not a de Polignac number, because 561544549 - 2⁹ = 561544037 is a prime.

It is a super-2 number, since 2×561544549² = 630664561023226802, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561544519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280772274 + 280772275.

It is an arithmetic number, because the mean of its divisors is an integer number (280772275).

Almost surely, 2^561544549 is an apocalyptic number.

It is an amenable number.

561544549 is a deficient number, since it is larger than the sum of its proper divisors (1).

561544549 is an equidigital number, since it uses as much as digits as its factorization.

561544549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432000, while the sum is 43.

The square root of 561544549 is about 23696.9312148219. The cubic root of 561544549 is about 825.0141651685.

The spelling of 561544549 in words is "five hundred sixty-one million, five hundred forty-four thousand, five hundred forty-nine".