1211330369 has 2 divisors, whose sum is σ = 1211330370. Its totient is φ = 1211330368.

The previous prime is 1211330333. The next prime is 1211330371. The reversal of 1211330369 is 9630331121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 991935025 + 219395344 = 31495^2 + 14812^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211330369 - 2¹² = 1211326273 is a prime.

It is a super-2 number, since 2×1211330369² = 2934642525723352322, which contains 22 as substring.

Together with 1211330371, 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 (1211330399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605665184 + 605665185.

It is an arithmetic number, because the mean of its divisors is an integer number (605665185).

Almost surely, 2^1211330369 is an apocalyptic number.

It is an amenable number.

1211330369 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211330369 is an equidigital number, since it uses as much as digits as its factorization.

1211330369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 1211330369 is about 34804.1717183443. The cubic root of 1211330369 is about 1065.9926293128.

The spelling of 1211330369 in words is "one billion, two hundred eleven million, three hundred thirty thousand, three hundred sixty-nine".