561191 has 2 divisors, whose sum is σ = 561192. Its totient is φ = 561190.

The previous prime is 561181. The next prime is 561199. The reversal of 561191 is 191165.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 561191 - 2¹⁴ = 544807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280595 + 280596.

It is an arithmetic number, because the mean of its divisors is an integer number (280596).

2⁵⁶¹¹⁹¹ is an apocalyptic number.

561191 is a deficient number, since it is larger than the sum of its proper divisors (1).

561191 is an equidigital number, since it uses as much as digits as its factorization.

561191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 270, while the sum is 23.

The square root of 561191 is about 749.1268250437. The cubic root of 561191 is about 82.4840985576.

The spelling of 561191 in words is "five hundred sixty-one thousand, one hundred ninety-one".