1212311311 has 2 divisors, whose sum is σ = 1212311312. Its totient is φ = 1212311310.

The previous prime is 1212311299. The next prime is 1212311417. The reversal of 1212311311 is 1131132121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1212311311 - 2¹³ = 1212303119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212341311) 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, 606155655 + 606155656.

It is an arithmetic number, because the mean of its divisors is an integer number (606155656).

Almost surely, 2^1212311311 is an apocalyptic number.

1212311311 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212311311 is an equidigital number, since it uses as much as digits as its factorization.

1212311311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36, while the sum is 16.

The square root of 1212311311 is about 34818.2611714026. The cubic root of 1212311311 is about 1066.2803005737.

Adding to 1212311311 its reverse (1131132121), we get a palindrome (2343443432).

The spelling of 1212311311 in words is "one billion, two hundred twelve million, three hundred eleven thousand, three hundred eleven".