561894941 has 2 divisors, whose sum is σ = 561894942. Its totient is φ = 561894940.

The previous prime is 561894929. The next prime is 561894959. The reversal of 561894941 is 149498165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 552720100 + 9174841 = 23510^2 + 3029^2 .

It is a cyclic number.

It is not a de Polignac number, because 561894941 - 2⁶ = 561894877 is a prime.

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

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561894901) 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, 280947470 + 280947471.

It is an arithmetic number, because the mean of its divisors is an integer number (280947471).

Almost surely, 2^561894941 is an apocalyptic number.

It is an amenable number.

561894941 is a deficient number, since it is larger than the sum of its proper divisors (1).

561894941 is an equidigital number, since it uses as much as digits as its factorization.

561894941 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 311040, while the sum is 47.

The square root of 561894941 is about 23704.3232554739. The cubic root of 561894941 is about 825.1857266581.

The spelling of 561894941 in words is "five hundred sixty-one million, eight hundred ninety-four thousand, nine hundred forty-one".