561810287 has 2 divisors, whose sum is σ = 561810288. Its totient is φ = 561810286.

The previous prime is 561810269. The next prime is 561810329. The reversal of 561810287 is 782018165.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 561810287 - 2¹⁰ = 561809263 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 561810287.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561810217) 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, 280905143 + 280905144.

It is an arithmetic number, because the mean of its divisors is an integer number (280905144).

Almost surely, 2^561810287 is an apocalyptic number.

561810287 is a deficient number, since it is larger than the sum of its proper divisors (1).

561810287 is an equidigital number, since it uses as much as digits as its factorization.

561810287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26880, while the sum is 38.

The square root of 561810287 is about 23702.5375645731. The cubic root of 561810287 is about 825.1442842841.

The spelling of 561810287 in words is "five hundred sixty-one million, eight hundred ten thousand, two hundred eighty-seven".