213611 has 2 divisors, whose sum is σ = 213612. Its totient is φ = 213610.

The previous prime is 213599. The next prime is 213613. The reversal of 213611 is 116312.

213611 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 213611 - 2¹⁰ = 212587 is a prime.

Together with 213613, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 14.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 213611.

It is not a weakly prime, because it can be changed into another prime (213613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106805 + 106806.

It is an arithmetic number, because the mean of its divisors is an integer number (106806).

2²¹³⁶¹¹ is an apocalyptic number.

213611 is a deficient number, since it is larger than the sum of its proper divisors (1).

213611 is an equidigital number, since it uses as much as digits as its factorization.

213611 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36, while the sum is 14.

The square root of 213611 is about 462.1807005923. The cubic root of 213611 is about 59.7779757301. Note that the first 3 decimals are identical.

Adding to 213611 its reverse (116312), we get a palindrome (329923).

The spelling of 213611 in words is "two hundred thirteen thousand, six hundred eleven".