561371617 has 2 divisors, whose sum is σ = 561371618. Its totient is φ = 561371616.

The previous prime is 561371599. The next prime is 561371633. The reversal of 561371617 is 716173165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 534580641 + 26790976 = 23121^2 + 5176^2 .

It is a cyclic number.

It is not a de Polignac number, because 561371617 - 2¹⁵ = 561338849 is a prime.

It is not a weakly prime, because it can be changed into another prime (561371677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280685808 + 280685809.

It is an arithmetic number, because the mean of its divisors is an integer number (280685809).

Almost surely, 2^561371617 is an apocalyptic number.

It is an amenable number.

561371617 is a deficient number, since it is larger than the sum of its proper divisors (1).

561371617 is an equidigital number, since it uses as much as digits as its factorization.

561371617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26460, while the sum is 37.

The square root of 561371617 is about 23693.2821069602. The cubic root of 561371617 is about 824.9294666360.

The spelling of 561371617 in words is "five hundred sixty-one million, three hundred seventy-one thousand, six hundred seventeen".