561681143 has 2 divisors, whose sum is σ = 561681144. Its totient is φ = 561681142.

The previous prime is 561681103. The next prime is 561681203. The reversal of 561681143 is 341186165.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 561681143 - 2⁶ = 561681079 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561681103) 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, 280840571 + 280840572.

It is an arithmetic number, because the mean of its divisors is an integer number (280840572).

Almost surely, 2^561681143 is an apocalyptic number.

561681143 is a deficient number, since it is larger than the sum of its proper divisors (1).

561681143 is an equidigital number, since it uses as much as digits as its factorization.

561681143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 35.

The square root of 561681143 is about 23699.8131427233. The cubic root of 561681143 is about 825.0810538057.

The spelling of 561681143 in words is "five hundred sixty-one million, six hundred eighty-one thousand, one hundred forty-three".