211040561 has 2 divisors, whose sum is σ = 211040562. Its totient is φ = 211040560.

The previous prime is 211040537. The next prime is 211040593. The reversal of 211040561 is 165040112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 150822961 + 60217600 = 12281^2 + 7760^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211040561 is a prime.

It is not a weakly prime, because it can be changed into another prime (211040461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105520280 + 105520281.

It is an arithmetic number, because the mean of its divisors is an integer number (105520281).

Almost surely, 2^211040561 is an apocalyptic number.

It is an amenable number.

211040561 is a deficient number, since it is larger than the sum of its proper divisors (1).

211040561 is an equidigital number, since it uses as much as digits as its factorization.

211040561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 211040561 is about 14527.2351464413. The cubic root of 211040561 is about 595.3723263417.

Adding to 211040561 its reverse (165040112), we get a palindrome (376080673).

The spelling of 211040561 in words is "two hundred eleven million, forty thousand, five hundred sixty-one".