1211333129 has 2 divisors, whose sum is σ = 1211333130. Its totient is φ = 1211333128.

The previous prime is 1211333017. The next prime is 1211333131. The reversal of 1211333129 is 9213331121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 755425225 + 455907904 = 27485^2 + 21352^2 .

It is an emirp because it is prime and its reverse (9213331121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1211333129 - 2¹⁶ = 1211267593 is a prime.

Together with 1211333131, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1211333098 and 1211333107.

It is not a weakly prime, because it can be changed into another prime (1211333329) 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, 605666564 + 605666565.

It is an arithmetic number, because the mean of its divisors is an integer number (605666565).

Almost surely, 2^1211333129 is an apocalyptic number.

It is an amenable number.

1211333129 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211333129 is an equidigital number, since it uses as much as digits as its factorization.

1211333129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 972, while the sum is 26.

The square root of 1211333129 is about 34804.2113687410. The cubic root of 1211333129 is about 1065.9934389289.

The spelling of 1211333129 in words is "one billion, two hundred eleven million, three hundred thirty-three thousand, one hundred twenty-nine".