1212031361 has 2 divisors, whose sum is σ = 1212031362. Its totient is φ = 1212031360.

The previous prime is 1212031357. The next prime is 1212031367. The reversal of 1212031361 is 1631302121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 831976336 + 380055025 = 28844^2 + 19495^2 .

It is an emirp because it is prime and its reverse (1631302121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1212031361 - 2² = 1212031357 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1212031367) 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, 606015680 + 606015681.

It is an arithmetic number, because the mean of its divisors is an integer number (606015681).

Almost surely, 2^1212031361 is an apocalyptic number.

It is an amenable number.

1212031361 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212031361 is an equidigital number, since it uses as much as digits as its factorization.

1212031361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 1212031361 is about 34814.2407787388. The cubic root of 1212031361 is about 1066.1982182055.

Adding to 1212031361 its reverse (1631302121), we get a palindrome (2843333482).

The spelling of 1212031361 in words is "one billion, two hundred twelve million, thirty-one thousand, three hundred sixty-one".