561850189 has 2 divisors, whose sum is σ = 561850190. Its totient is φ = 561850188.

The previous prime is 561850129. The next prime is 561850207. The reversal of 561850189 is 981058165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 475676100 + 86174089 = 21810^2 + 9283^2 .

It is a cyclic number.

It is not a de Polignac number, because 561850189 - 2¹¹ = 561848141 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is equal to p_29433967 and since 561850189 and 29433967 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 (561850129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280925094 + 280925095.

It is an arithmetic number, because the mean of its divisors is an integer number (280925095).

Almost surely, 2^561850189 is an apocalyptic number.

It is an amenable number.

561850189 is a deficient number, since it is larger than the sum of its proper divisors (1).

561850189 is an equidigital number, since it uses as much as digits as its factorization.

561850189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 86400, while the sum is 43.

The square root of 561850189 is about 23703.3792738504. The cubic root of 561850189 is about 825.1638188307.

The spelling of 561850189 in words is "five hundred sixty-one million, eight hundred fifty thousand, one hundred eighty-nine".