211493 has 2 divisors, whose sum is σ = 211494. Its totient is φ = 211492.
The previous prime is 211469. The next prime is 211499. The reversal of 211493 is 394112.
211493 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 can be written as a sum of positive squares in only one way, i.e., 195364 + 16129 = 442^2 + 127^2 .
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-211493 is a prime.
It is a Sophie Germain prime.
It is a Chen prime.
It is a Curzon number.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (211499) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105746 + 105747.
It is an arithmetic number, because the mean of its divisors is an integer number (105747).
2211493 is an apocalyptic number.
It is an amenable number.
211493 is a deficient number, since it is larger than the sum of its proper divisors (1).
211493 is an equidigital number, since it uses as much as digits as its factorization.
211493 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 216, while the sum is 20.
The square root of 211493 is about 459.8836809455. The cubic root of 211493 is about 59.5797485360.
The spelling of 211493 in words is "two hundred eleven thousand, four hundred ninety-three".
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