561647941 has 2 divisors, whose sum is σ = 561647942. Its totient is φ = 561647940.

The previous prime is 561647917. The next prime is 561647981. The reversal of 561647941 is 149746165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 474150625 + 87497316 = 21775^2 + 9354^2 .

It is a cyclic number.

It is not a de Polignac number, because 561647941 - 2⁷ = 561647813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561647981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280823970 + 280823971.

It is an arithmetic number, because the mean of its divisors is an integer number (280823971).

Almost surely, 2^561647941 is an apocalyptic number.

It is an amenable number.

561647941 is a deficient number, since it is larger than the sum of its proper divisors (1).

561647941 is an equidigital number, since it uses as much as digits as its factorization.

561647941 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 43.

The square root of 561647941 is about 23699.1126627138. The cubic root of 561647941 is about 825.0647961351.

The spelling of 561647941 in words is "five hundred sixty-one million, six hundred forty-seven thousand, nine hundred forty-one".