561475549 has 2 divisors, whose sum is σ = 561475550. Its totient is φ = 561475548.

The previous prime is 561475547. The next prime is 561475559. The reversal of 561475549 is 945574165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 531302500 + 30173049 = 23050^2 + 5493^2 .

It is a cyclic number.

It is not a de Polignac number, because 561475549 - 2¹ = 561475547 is a prime.

Together with 561475547, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 561475499 and 561475508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561475547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280737774 + 280737775.

It is an arithmetic number, because the mean of its divisors is an integer number (280737775).

Almost surely, 2^561475549 is an apocalyptic number.

It is an amenable number.

561475549 is a deficient number, since it is larger than the sum of its proper divisors (1).

561475549 is an equidigital number, since it uses as much as digits as its factorization.

561475549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 756000, while the sum is 46.

The square root of 561475549 is about 23695.4752853789. The cubic root of 561475549 is about 824.9803724746.

The spelling of 561475549 in words is "five hundred sixty-one million, four hundred seventy-five thousand, five hundred forty-nine".