1211133331 has 2 divisors, whose sum is σ = 1211133332. Its totient is φ = 1211133330.

The previous prime is 1211133307. The next prime is 1211133347. The reversal of 1211133331 is 1333311121.

It is a strong prime.

It is an emirp because it is prime and its reverse (1333311121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1211133331 - 2⁵ = 1211133299 is a prime.

It is a super-2 number, since 2×1211133331² = 2933687890918311122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1211133299 and 1211133308.

It is not a weakly prime, because it can be changed into another prime (1211133361) 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, 605566665 + 605566666.

It is an arithmetic number, because the mean of its divisors is an integer number (605566666).

Almost surely, 2^1211133331 is an apocalyptic number.

1211133331 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211133331 is an equidigital number, since it uses as much as digits as its factorization.

1211133331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 162, while the sum is 19.

The square root of 1211133331 is about 34801.3409368087. The cubic root of 1211133331 is about 1065.9348271776.

Adding to 1211133331 its reverse (1333311121), we get a palindrome (2544444452).

The spelling of 1211133331 in words is "one billion, two hundred eleven million, one hundred thirty-three thousand, three hundred thirty-one".