561641137 has 2 divisors, whose sum is σ = 561641138. Its totient is φ = 561641136.

The previous prime is 561641107. The next prime is 561641149. The reversal of 561641137 is 731146165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 485585296 + 76055841 = 22036^2 + 8721^2 .

It is a cyclic number.

It is not a de Polignac number, because 561641137 - 2²³ = 553252529 is a prime.

It is not a weakly prime, because it can be changed into another prime (561641107) 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, 280820568 + 280820569.

It is an arithmetic number, because the mean of its divisors is an integer number (280820569).

Almost surely, 2^561641137 is an apocalyptic number.

It is an amenable number.

561641137 is a deficient number, since it is larger than the sum of its proper divisors (1).

561641137 is an equidigital number, since it uses as much as digits as its factorization.

561641137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 34.

The square root of 561641137 is about 23698.9691126007. The cubic root of 561641137 is about 825.0614644136.

The spelling of 561641137 in words is "five hundred sixty-one million, six hundred forty-one thousand, one hundred thirty-seven".