561894257 has 2 divisors, whose sum is σ = 561894258. Its totient is φ = 561894256.

The previous prime is 561894253. The next prime is 561894271. The reversal of 561894257 is 752498165.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 561879616 + 14641 = 23704^2 + 121^2 .

It is a cyclic number.

It is not a de Polignac number, because 561894257 - 2² = 561894253 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (561894253) 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, 280947128 + 280947129.

It is an arithmetic number, because the mean of its divisors is an integer number (280947129).

Almost surely, 2^561894257 is an apocalyptic number.

It is an amenable number.

561894257 is a deficient number, since it is larger than the sum of its proper divisors (1).

561894257 is an equidigital number, since it uses as much as digits as its factorization.

561894257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 604800, while the sum is 47.

The square root of 561894257 is about 23704.3088277216. The cubic root of 561894257 is about 825.1853918225.

The spelling of 561894257 in words is "five hundred sixty-one million, eight hundred ninety-four thousand, two hundred fifty-seven".