561117211 has 2 divisors, whose sum is σ = 561117212. Its totient is φ = 561117210.

The previous prime is 561117203. The next prime is 561117217. The reversal of 561117211 is 112711165.

561117211 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 561117211 - 2³ = 561117203 is a prime.

It is not a weakly prime, because it can be changed into another prime (561117217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280558605 + 280558606.

It is an arithmetic number, because the mean of its divisors is an integer number (280558606).

Almost surely, 2^561117211 is an apocalyptic number.

561117211 is a deficient number, since it is larger than the sum of its proper divisors (1).

561117211 is an equidigital number, since it uses as much as digits as its factorization.

561117211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 420, while the sum is 25.

The square root of 561117211 is about 23687.9127615753. The cubic root of 561117211 is about 824.8048321927.

Adding to 561117211 its reverse (112711165), we get a palindrome (673828376).

It can be divided in two parts, 5611 and 17211, that added together give a palindrome (22822).

The spelling of 561117211 in words is "five hundred sixty-one million, one hundred seventeen thousand, two hundred eleven".