561994243 has 2 divisors, whose sum is σ = 561994244. Its totient is φ = 561994242.

The previous prime is 561994231. The next prime is 561994253. The reversal of 561994243 is 342499165.

561994243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561994243 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 561994243.

It is not a weakly prime, because it can be changed into another prime (561994253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280997121 + 280997122.

It is an arithmetic number, because the mean of its divisors is an integer number (280997122).

Almost surely, 2^561994243 is an apocalyptic number.

561994243 is a deficient number, since it is larger than the sum of its proper divisors (1).

561994243 is an equidigital number, since it uses as much as digits as its factorization.

561994243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 233280, while the sum is 43.

The square root of 561994243 is about 23706.4177597544. The cubic root of 561994243 is about 825.2343346572.

The spelling of 561994243 in words is "five hundred sixty-one million, nine hundred ninety-four thousand, two hundred forty-three".