11211131 has 2 divisors, whose sum is σ = 11211132. Its totient is φ = 11211130.

The previous prime is 11211103. The next prime is 11211133. The reversal of 11211131 is 13111211.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (13111211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11211131 - 2¹⁴ = 11194747 is a prime.

It is a super-2 number, since 2×11211131² = 251378916598322, which contains 22 as substring.

Together with 11211133, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11211133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5605565 + 5605566.

It is an arithmetic number, because the mean of its divisors is an integer number (5605566).

Almost surely, 2^11211131 is an apocalyptic number.

11211131 is a deficient number, since it is larger than the sum of its proper divisors (1).

11211131 is an equidigital number, since it uses as much as digits as its factorization.

11211131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6, while the sum is 11.

The square root of 11211131 is about 3348.3027043563. The cubic root of 11211131 is about 223.8118836767.

Adding to 11211131 its reverse (13111211), we get a palindrome (24322342).

It can be divided in two parts, 11211 and 131, that multiplied together give a palindrome (1468641).

The spelling of 11211131 in words is "eleven million, two hundred eleven thousand, one hundred thirty-one".