561605497 has 2 divisors, whose sum is σ = 561605498. Its totient is φ = 561605496.

The previous prime is 561605479. The next prime is 561605507. The reversal of 561605497 is 794506165.

Together with previous prime (561605479) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 363893776 + 197711721 = 19076^2 + 14061^2 .

It is a cyclic number.

It is not a de Polignac number, because 561605497 - 2¹⁵ = 561572729 is a prime.

It is not a weakly prime, because it can be changed into another prime (561605417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280802748 + 280802749.

It is an arithmetic number, because the mean of its divisors is an integer number (280802749).

Almost surely, 2^561605497 is an apocalyptic number.

It is an amenable number.

561605497 is a deficient number, since it is larger than the sum of its proper divisors (1).

561605497 is an equidigital number, since it uses as much as digits as its factorization.

561605497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 226800, while the sum is 43.

The square root of 561605497 is about 23698.2171692303. The cubic root of 561605497 is about 825.0440120995.

The spelling of 561605497 in words is "five hundred sixty-one million, six hundred five thousand, four hundred ninety-seven".