1111211 has 2 divisors, whose sum is σ = 1111212.
Its totient is φ = 1111210.
The previous prime is 1111189. The next prime is 1111213. The reversal of 1111211 is 1121111.
It is a happy number.
It is a m-pointer prime, because the next prime (1111213) can be obtained adding 1111211 to its product of digits (2).
It is a strong prime.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-1111211 is a prime.
Together with 1111213, it forms a pair of twin primes.
It is a Chen prime.
It is an Ulam number.
It is not a weakly prime, because it can be changed into another prime (1111213) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555605 + 555606.
It is an arithmetic number, because the mean of its divisors is an integer number (555606).
21111211 is an apocalyptic number.
1111211 is a deficient number, since it is larger than the sum of its proper divisors (1).
1111211 is an equidigital number, since it uses as much as digits as its factorization.
1111211 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 2, while the sum is 8.
The square root of 1111211 is about 1054.1399337849.
The cubic root of 1111211 is about 103.5775205521.
Adding to 1111211 its reverse (1121111), we get a palindrome (2232322).
It can be divided in two parts, 111 and 1211, that multiplied together give a triangular number (134421 = T518).
The spelling of 1111211 in words is "one million, one hundred eleven thousand, two hundred eleven".