561271211 has 2 divisors, whose sum is σ = 561271212. Its totient is φ = 561271210.

The previous prime is 561271199. The next prime is 561271237. The reversal of 561271211 is 112172165.

It is an a-pointer prime, because the next prime (561271237) can be obtained adding 561271211 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 561271211 - 2²² = 557076907 is a prime.

It is not a weakly prime, because it can be changed into another prime (561271111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280635605 + 280635606.

It is an arithmetic number, because the mean of its divisors is an integer number (280635606).

Almost surely, 2^561271211 is an apocalyptic number.

561271211 is a deficient number, since it is larger than the sum of its proper divisors (1).

561271211 is an equidigital number, since it uses as much as digits as its factorization.

561271211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 840, while the sum is 26.

The square root of 561271211 is about 23691.1631415598. The cubic root of 561271211 is about 824.8802818630.

The spelling of 561271211 in words is "five hundred sixty-one million, two hundred seventy-one thousand, two hundred eleven".