1211918341 has 2 divisors, whose sum is σ = 1211918342. Its totient is φ = 1211918340.

The previous prime is 1211918339. The next prime is 1211918377. The reversal of 1211918341 is 1438191121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1204784100 + 7134241 = 34710^2 + 2671^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211918341 - 2¹ = 1211918339 is a prime.

Together with 1211918339, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211912341) 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, 605959170 + 605959171.

It is an arithmetic number, because the mean of its divisors is an integer number (605959171).

Almost surely, 2^1211918341 is an apocalyptic number.

It is an amenable number.

1211918341 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211918341 is an equidigital number, since it uses as much as digits as its factorization.

1211918341 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 31.

The square root of 1211918341 is about 34812.6175545592. The cubic root of 1211918341 is about 1066.1650767450.

The spelling of 1211918341 in words is "one billion, two hundred eleven million, nine hundred eighteen thousand, three hundred forty-one".