561161 has 2 divisors, whose sum is σ = 561162. Its totient is φ = 561160.

The previous prime is 561109. The next prime is 561173. The reversal of 561161 is 161165.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 295936 + 265225 = 544^2 + 515^2 .

It is a cyclic number.

It is not a de Polignac number, because 561161 - 2⁶ = 561097 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (561101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280580 + 280581.

It is an arithmetic number, because the mean of its divisors is an integer number (280581).

2⁵⁶¹¹⁶¹ is an apocalyptic number.

It is an amenable number.

561161 is a deficient number, since it is larger than the sum of its proper divisors (1).

561161 is an equidigital number, since it uses as much as digits as its factorization.

561161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 180, while the sum is 20.

The square root of 561161 is about 749.1068014643. The cubic root of 561161 is about 82.4826287270.

The spelling of 561161 in words is "five hundred sixty-one thousand, one hundred sixty-one".