561242173 has 2 divisors, whose sum is σ = 561242174. Its totient is φ = 561242172.

The previous prime is 561242147. The next prime is 561242237. The reversal of 561242173 is 371242165.

561242173 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 521071929 + 40170244 = 22827^2 + 6338^2 .

It is a cyclic number.

It is not a de Polignac number, because 561242173 - 2⁵ = 561242141 is a prime.

It is equal to p_29403760 and since 561242173 and 29403760 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561248173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280621086 + 280621087.

It is an arithmetic number, because the mean of its divisors is an integer number (280621087).

Almost surely, 2^561242173 is an apocalyptic number.

It is an amenable number.

561242173 is a deficient number, since it is larger than the sum of its proper divisors (1).

561242173 is an equidigital number, since it uses as much as digits as its factorization.

561242173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 31.

The square root of 561242173 is about 23690.5502890921. The cubic root of 561242173 is about 824.8660562466.

The spelling of 561242173 in words is "five hundred sixty-one million, two hundred forty-two thousand, one hundred seventy-three".