561110521 has 2 divisors, whose sum is σ = 561110522. Its totient is φ = 561110520.

The previous prime is 561110503. The next prime is 561110567. The reversal of 561110521 is 125011165.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 408242025 + 152868496 = 20205^2 + 12364^2 .

It is a cyclic number.

It is not a de Polignac number, because 561110521 - 2²⁵ = 527556089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 561110492 and 561110501.

It is not a weakly prime, because it can be changed into another prime (561110321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280555260 + 280555261.

It is an arithmetic number, because the mean of its divisors is an integer number (280555261).

Almost surely, 2^561110521 is an apocalyptic number.

It is an amenable number.

561110521 is a deficient number, since it is larger than the sum of its proper divisors (1).

561110521 is an equidigital number, since it uses as much as digits as its factorization.

561110521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 300, while the sum is 22.

The square root of 561110521 is about 23687.7715498947. The cubic root of 561110521 is about 824.8015542286.

Adding to 561110521 its reverse (125011165), we get a palindrome (686121686).

The spelling of 561110521 in words is "five hundred sixty-one million, one hundred ten thousand, five hundred twenty-one".