1211233113 has 6 divisors (see below), whose sum is σ = 1749558954. Its totient is φ = 807488736.

The previous prime is 1211233103. The next prime is 1211233123. The reversal of 1211233113 is 3113321121.

It is an interprime number because it is at equal distance from previous prime (1211233103) and next prime (1211233123).

It can be written as a sum of positive squares in only one way, i.e., 1032529689 + 178703424 = 32133^2 + 13368^2 .

It is not a de Polignac number, because 1211233113 - 2⁸ = 1211232857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211233103) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67290720 + ... + 67290737.

It is an arithmetic number, because the mean of its divisors is an integer number (291593159).

Almost surely, 2^1211233113 is an apocalyptic number.

It is an amenable number.

1211233113 is a deficient number, since it is larger than the sum of its proper divisors (538325841).

1211233113 is a wasteful number, since it uses less digits than its factorization.

1211233113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134581463 (or 134581460 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 1211233113 is about 34802.7745014676. The cubic root of 1211233113 is about 1065.9640995364.

Adding to 1211233113 its reverse (3113321121), we get a palindrome (4324554234).

It can be divided in two parts, 1211233 and 113, that added together give a triangular number (1211346 = T₁₅₅₆).

The spelling of 1211233113 in words is "one billion, two hundred eleven million, two hundred thirty-three thousand, one hundred thirteen".