1211343113 has 2 divisors, whose sum is σ = 1211343114. Its totient is φ = 1211343112.

The previous prime is 1211343097. The next prime is 1211343121. The reversal of 1211343113 is 3113431121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1200761104 + 10582009 = 34652^2 + 3253^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211343113 - 2⁴ = 1211343097 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211342113) 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, 605671556 + 605671557.

It is an arithmetic number, because the mean of its divisors is an integer number (605671557).

Almost surely, 2^1211343113 is an apocalyptic number.

It is an amenable number.

1211343113 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211343113 is an equidigital number, since it uses as much as digits as its factorization.

1211343113 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 1211343113 is about 34804.3547993638. The cubic root of 1211343113 is about 1065.9963676165.

Adding to 1211343113 its reverse (3113431121), we get a palindrome (4324774234).

The spelling of 1211343113 in words is "one billion, two hundred eleven million, three hundred forty-three thousand, one hundred thirteen".